good question isn't it?
if somebody knows a way how to do it please explain it step by step
Well if you do not want to play online then there MAY be one way...
Do not install EADM (EA Download Manager) while installing the game. If you come up with nag screens in game, try applying a game fix, which is illegal because the game deals with authentication.
But I can't think of anymore ways except another silly one. Disable the internet while playing.