If you’ve had your phone stolen, then you may wish to use this method. If you wish to remove your main account, then your only option is to factory reset your device.
Note that you may not be able to do this if you have set this email address as your main email address for your account, since it’s likely that Google Play will use this account. Then select “Remove” or “Remove account” option.On the next screen, tap the 3-dot menu icon or “More” option found at the top-right corner of the screen.Now tap the Gmail ID you want to sign off.Scroll down to “Accounts” or “Accounts and Sync”.If you want to sign out from your Android phone, you can do it in just a few simple steps: Its very simple Steps to Sign Out of Google Account on Android