diff --git a/Gems/PhysX/Code/Source/System/PhysXSystem.cpp b/Gems/PhysX/Code/Source/System/PhysXSystem.cpp
index cc55255e24..0c3e6d0b31 100644
--- a/Gems/PhysX/Code/Source/System/PhysXSystem.cpp
+++ b/Gems/PhysX/Code/Source/System/PhysXSystem.cpp
@@ -251,7 +251,7 @@ namespace PhysX
 
         if (sceneItr != m_sceneList.end())
         {
-            return AzPhysics::SceneHandle((*sceneItr)->GetId(), AZStd::distance(m_sceneList.begin(), sceneItr));
+            return AzPhysics::SceneHandle((*sceneItr)->GetId(), static_cast<AzPhysics::SceneIndex>(AZStd::distance(m_sceneList.begin(), sceneItr)));
         }
         return AzPhysics::InvalidSceneHandle;
     }
@@ -312,7 +312,7 @@ namespace PhysX
                 {
                     m_sceneRemovedEvent.Signal(handle);
                     m_sceneList[index].reset();
-                    m_freeSceneSlots.push(index);
+                    m_freeSceneSlots.push(static_cast<AzPhysics::SceneIndex>(index));
                 }
             }
         }
diff --git a/Gems/PhysX/Code/Source/SystemComponent.cpp b/Gems/PhysX/Code/Source/SystemComponent.cpp
index d8c4b47a2a..42c78d2c1d 100644
--- a/Gems/PhysX/Code/Source/SystemComponent.cpp
+++ b/Gems/PhysX/Code/Source/SystemComponent.cpp
@@ -396,7 +396,7 @@ namespace PhysX
 
     void SystemComponent::SetCollisionLayerName(int index, const AZStd::string& layerName)
     {
-        m_physXSystem->SetCollisionLayerName(aznumeric_cast<AZ::u64>(index), layerName);
+        m_physXSystem->SetCollisionLayerName(aznumeric_cast<int>(index), layerName);
     }
 
     void SystemComponent::CreateCollisionGroup(const AZStd::string& groupName, const AzPhysics::CollisionGroup& group)
diff --git a/Gems/PhysX/Code/Tests/PhysXSceneTests.cpp b/Gems/PhysX/Code/Tests/PhysXSceneTests.cpp
index ff112a75dd..5b90ef0004 100644
--- a/Gems/PhysX/Code/Tests/PhysXSceneTests.cpp
+++ b/Gems/PhysX/Code/Tests/PhysXSceneTests.cpp
@@ -94,7 +94,7 @@ namespace PhysX
         //invalid scene handle returns empty
         AzPhysics::SimulatedBodyHandleList emptyBodies = sceneInterface->AddSimulatedBodies(AzPhysics::InvalidSceneHandle, configs);
         EXPECT_TRUE(emptyBodies.empty());
-        emptyBodies = sceneInterface->AddSimulatedBodies(AzPhysics::SceneHandle(2347892347890, 7), configs);
+        emptyBodies = sceneInterface->AddSimulatedBodies(AzPhysics::SceneHandle(static_cast<AZ::u32>(2347892347890), AzPhysics::SceneIndex(7)), configs);
         EXPECT_TRUE(emptyBodies.empty());
 
         //add some rigid bodies
@@ -165,7 +165,7 @@ namespace PhysX
         //invalid scene handle returns null
         AzPhysics::SimulatedBody* nullBody = sceneInterface->GetSimulatedBodyFromHandle(AzPhysics::InvalidSceneHandle, newBodies[0]);
         EXPECT_TRUE(nullBody == nullptr);
-        nullBody = sceneInterface->GetSimulatedBodyFromHandle(AzPhysics::SceneHandle(2347892347890, 7), newBodies[0]);
+        nullBody = sceneInterface->GetSimulatedBodyFromHandle(AzPhysics::SceneHandle(static_cast<AZ::u32>(2347892347890), AzPhysics::SceneIndex(7)), newBodies[0]);
         EXPECT_TRUE(nullBody == nullptr);
 
         //invalid simulated body handle returns null