EA will not allow you to use their brand even if you coded a 100% clone from the gound up. An independent clone is the best you can hope for.
But why bother on the amiga? It's vastly more satisfying putting together games on modern platforms. Fast hardware, no more writing your own freakin raycaster, etc. You can write some cool graphics effects in less than 40 lines in c# with xna that would be impossible on any amiga.
Even if you did a nice sims clone on amiga all proper and stuff, only like some 2000 people would even be able to run it.