How to prevent my IP address from getting banned?

I'm trying to play a game online, and to be honest I want to make multiple accounts to send myself money in the game. Cheating, I know, who cares. However, when multiple IP addresses logon to accounts on the same computer, the game bans me. And so, how do I prevent the game from being able to detect this? I would guess some kind of IP address blocker, but I am not really sure. Can you help?