The Sims is protected with the SafeDisc protection. You can copy the game with CloneCD (Fast Error Skip enabled). You can download this program from www.elby.de
If your burner isn't supported by CloneCD you can use a crack (www.gamecopyworld.com).
In the future you can scan your disc with a so-called copy-protection scanner like ClonyXL. It will also give you the correct settings to use with CloneCD.