Where is Android SDK manager download files?
In Android Studio, open the Settings dialog (Preferences on macOS), then navigate to Appearance &amp; Behavior > System Settings > Android SDK.
  Change the value of Android SDK Location to C:\WorkFolder\AndroidSDK.
  
  To avoid downloading the SDK again, make sure to copy the existing SDK directory, located at %USERPROFILE%\AppData\Local\Android\SDK by default, to the new location.


From https://developer.android.com/studio/intro/studio-config#antivirus-impact