Are there any tools to sandbox a malware application even more than the granted permissions on Android?
XPrivacyLua is a module for Xposed framework which does exactly what you need. It is free and open source. Works on rooted devices. It's the successor of XPrivacy.

Install Xposed from here:
https://forum.xda-developers.com/showthread.php?t=3034811

You can then download the XPrivacyLua module from the Xposed repo through the Xposed Manager app, or manually from here:

https://repo.xposed.info/module/eu.faircode.xlua

Source:

https://github.com/M66B/XPrivacyLua



If you're running Android 5 or lower, you can use the legacy XPrivacy module.