Can someone with a GED take their SATs and what are the limitations?

Sure you can take your SAT's. Contact the local high school in which you should have attended and asks them when they offer the exam so that you can take it. It may cost you $25 dollars or so to do. No limitations other than you will miss any review given for free at the high school. A local SAT preperation manual purchased at any book store or Kaplan offers alternate review for about $500.00.