diff --git a/backend/sandbox/api.py b/backend/sandbox/api.py
index 5e654a4c..f937361d 100644
--- a/backend/sandbox/api.py
+++ b/backend/sandbox/api.py
@@ -6,7 +6,7 @@ from fastapi import FastAPI, UploadFile, File, HTTPException, APIRouter, Form, D
 from fastapi.responses import Response
 from pydantic import BaseModel
 
-from sandbox.sandbox import get_or_start_sandbox
+from sandbox.sandbox import get_or_start_sandbox, delete_sandbox
 from utils.logger import logger
 from utils.auth_utils import get_optional_user_id
 from services.supabase import DBConnection
@@ -305,6 +305,28 @@ async def delete_file(
         logger.error(f"Error deleting file in sandbox {sandbox_id}: {str(e)}")
         raise HTTPException(status_code=500, detail=str(e))
 
+@router.delete("/sandboxes/{sandbox_id}")
+async def delete_sandbox_route(
+    sandbox_id: str,
+    request: Request = None,
+    user_id: Optional[str] = Depends(get_optional_user_id)
+):
+    """Delete an entire sandbox"""
+    logger.info(f"Received sandbox delete request for sandbox {sandbox_id}, user_id: {user_id}")
+    client = await db.client
+    
+    # Verify the user has access to this sandbox
+    await verify_sandbox_access(client, sandbox_id, user_id)
+    
+    try:
+        # Delete the sandbox using the sandbox module function
+        await delete_sandbox(sandbox_id)
+        
+        return {"status": "success", "deleted": True, "sandbox_id": sandbox_id}
+    except Exception as e:
+        logger.error(f"Error deleting sandbox {sandbox_id}: {str(e)}")
+        raise HTTPException(status_code=500, detail=str(e))
+
 # Should happen on server-side fully
 @router.post("/project/{project_id}/sandbox/ensure-active")
 async def ensure_project_sandbox_active(
diff --git a/backend/sandbox/sandbox.py b/backend/sandbox/sandbox.py
index 5e7bc9b2..6c9691ea 100644
--- a/backend/sandbox/sandbox.py
+++ b/backend/sandbox/sandbox.py
@@ -125,3 +125,20 @@ def create_sandbox(password: str, project_id: str = None):
     logger.debug(f"Sandbox environment successfully initialized")
     return sandbox
 
+async def delete_sandbox(sandbox_id: str):
+    """Delete a sandbox by its ID."""
+    logger.info(f"Deleting sandbox with ID: {sandbox_id}")
+    
+    try:
+        # Get the sandbox
+        sandbox = daytona.get_current_sandbox(sandbox_id)
+        
+        # Delete the sandbox
+        daytona.remove(sandbox)
+        
+        logger.info(f"Successfully deleted sandbox {sandbox_id}")
+        return True
+    except Exception as e:
+        logger.error(f"Error deleting sandbox {sandbox_id}: {str(e)}")
+        raise e
+
diff --git a/frontend/src/components/sidebar/nav-agents.tsx b/frontend/src/components/sidebar/nav-agents.tsx
index 6011f43f..3c0b25e4 100644
--- a/frontend/src/components/sidebar/nav-agents.tsx
+++ b/frontend/src/components/sidebar/nav-agents.tsx
@@ -225,10 +225,16 @@ export function NavAgents() {
       // Store threadToDelete in a local variable since it might be cleared
       const deletedThread = { ...threadToDelete };
 
+      // Get sandbox ID from projects data
+      const thread = combinedThreads.find(t => t.threadId === threadId);
+      const project = projects.find(p => p.id === thread?.projectId);
+      const sandboxId = project?.sandbox?.id;
+
       // Log operation start
       console.log('DELETION - Starting thread deletion process', {
         threadId: deletedThread.id,
         isCurrentThread: isActive,
+        sandboxId
       });
 
       // Use the centralized deletion system with completion callback
@@ -236,9 +242,9 @@ export function NavAgents() {
         threadId,
         isActive,
         async () => {
-          // Delete the thread using the mutation
+          // Delete the thread using the mutation with sandbox ID
           deleteThreadMutation(
-            { threadId },
+            { threadId, sandboxId },
             {
               onSuccess: () => {
                 // Invalidate queries to refresh the list
@@ -282,6 +288,13 @@ export function NavAgents() {
         deleteMultipleThreadsMutation(
           {
             threadIds: threadIdsToDelete,
+            threadSandboxMap: Object.fromEntries(
+              threadIdsToDelete.map(threadId => {
+                const thread = combinedThreads.find(t => t.threadId === threadId);
+                const project = projects.find(p => p.id === thread?.projectId);
+                return [threadId, project?.sandbox?.id || ''];
+              }).filter(([, sandboxId]) => sandboxId)
+            ),
             onProgress: handleDeletionProgress
           },
           {
diff --git a/frontend/src/hooks/react-query/sidebar/use-sidebar.ts b/frontend/src/hooks/react-query/sidebar/use-sidebar.ts
index 5eec10e1..19c12739 100644
--- a/frontend/src/hooks/react-query/sidebar/use-sidebar.ts
+++ b/frontend/src/hooks/react-query/sidebar/use-sidebar.ts
@@ -33,12 +33,13 @@ export const useThreads = createQueryHook(
 
 interface DeleteThreadVariables {
   threadId: string;
+  sandboxId?: string;
   isNavigateAway?: boolean;
 }
 
 export const useDeleteThread = createMutationHook(
-  async ({ threadId }: DeleteThreadVariables) => {
-    return await deleteThread(threadId);
+  async ({ threadId, sandboxId }: DeleteThreadVariables) => {
+    return await deleteThread(threadId, sandboxId);
   },
   {
     onSuccess: () => {
@@ -48,16 +49,18 @@ export const useDeleteThread = createMutationHook(
 
 interface DeleteMultipleThreadsVariables {
   threadIds: string[];
+  threadSandboxMap?: Record<string, string>;
   onProgress?: (completed: number, total: number) => void;
 }
 
 export const useDeleteMultipleThreads = createMutationHook(
-  async ({ threadIds, onProgress }: DeleteMultipleThreadsVariables) => {
+  async ({ threadIds, threadSandboxMap, onProgress }: DeleteMultipleThreadsVariables) => {
     let completedCount = 0;
     const results = await Promise.all(
       threadIds.map(async (threadId) => {
         try {
-          const result = await deleteThread(threadId);
+          const sandboxId = threadSandboxMap?.[threadId];
+          const result = await deleteThread(threadId, sandboxId);
           completedCount++;
           onProgress?.(completedCount, threadIds.length);
           return { success: true, threadId };
diff --git a/frontend/src/hooks/react-query/threads/utils.ts b/frontend/src/hooks/react-query/threads/utils.ts
index 9bbc7d38..47bb49d6 100644
--- a/frontend/src/hooks/react-query/threads/utils.ts
+++ b/frontend/src/hooks/react-query/threads/utils.ts
@@ -74,41 +74,99 @@ export const toggleThreadPublicStatus = async (
     return updateThread(threadId, { is_public: isPublic });
 };
 
-export const deleteThread = async (threadId: string): Promise<void> => {
+const deleteSandbox = async (sandboxId: string): Promise<void> => {
+  try {
+    const supabase = createClient();
+    const {
+      data: { session },
+    } = await supabase.auth.getSession();
+
+    const headers: Record<string, string> = {
+      'Content-Type': 'application/json',
+    };
+
+    if (session?.access_token) {
+      headers['Authorization'] = `Bearer ${session.access_token}`;
+    }
+
+    const response = await fetch(`${API_URL}/sandboxes/${sandboxId}`, {
+      method: 'DELETE',
+      headers,
+    });
+
+    if (!response.ok) {
+      console.warn('Failed to delete sandbox, continuing with thread deletion');
+    }
+  } catch (error) {
+    console.warn('Error deleting sandbox, continuing with thread deletion:', error);
+  }
+};
+
+export const deleteThread = async (threadId: string, sandboxId?: string): Promise<void> => {
     try {
       const supabase = createClient();
-  
+
+      // If sandbox ID is provided, delete it directly
+      if (sandboxId) {
+        await deleteSandbox(sandboxId);
+      } else {
+        // Otherwise, get the thread to find its project and sandbox
+        const { data: thread, error: threadError } = await supabase
+          .from('threads')
+          .select('project_id')
+          .eq('thread_id', threadId)
+          .single();
+
+        if (threadError) {
+          console.error('Error fetching thread:', threadError);
+          throw new Error(`Error fetching thread: ${threadError.message}`);
+        }
+
+        // If thread has a project, get sandbox ID and delete it
+        if (thread?.project_id) {
+          const { data: project } = await supabase
+            .from('projects')
+            .select('sandbox')
+            .eq('project_id', thread.project_id)
+            .single();
+
+          if (project?.sandbox?.id) {
+            await deleteSandbox(project.sandbox.id);
+          }
+        }
+      }
+
       console.log(`Deleting all agent runs for thread ${threadId}`);
       const { error: agentRunsError } = await supabase
         .from('agent_runs')
         .delete()
         .eq('thread_id', threadId);
-  
+
       if (agentRunsError) {
         console.error('Error deleting agent runs:', agentRunsError);
         throw new Error(`Error deleting agent runs: ${agentRunsError.message}`);
       }
-  
+
       console.log(`Deleting all messages for thread ${threadId}`);
       const { error: messagesError } = await supabase
         .from('messages')
         .delete()
         .eq('thread_id', threadId);
-  
+
       if (messagesError) {
         console.error('Error deleting messages:', messagesError);
         throw new Error(`Error deleting messages: ${messagesError.message}`);
       }
 
       console.log(`Deleting thread ${threadId}`);
-      const { error: threadError } = await supabase
+      const { error: threadError2 } = await supabase
         .from('threads')
         .delete()
         .eq('thread_id', threadId);
   
-      if (threadError) {
-        console.error('Error deleting thread:', threadError);
-        throw new Error(`Error deleting thread: ${threadError.message}`);
+      if (threadError2) {
+        console.error('Error deleting thread:', threadError2);
+        throw new Error(`Error deleting thread: ${threadError2.message}`);
       }
   
       console.log(