Board Thread:Support Requests - Getting Started/@comment-32924241-20170822181306/@comment-27345308-20170822181846

At least back when I played Clash of Clans, it used to be possible by disconnecting the connected Google account if it's connected and connecting with another Google account.

This would be more suitable question for the Clash of Clans wiki, though, so you should post your question there to get a more definite response.