Sims played 15 games (1 start) for the Philadelphia Eagles in 2012 but was cut after training camp ended in 2013. In 2012, Sims made 8 tackles (1 for loss) and had one pass defensed, too. He was a two-year letterman at Iowa State in 2009-2010, making 188 tackles and 6 picks in 24 games. In 2009 as a junior, he was named the Big 12 Defensive Newcomer of the Year. He was originally signed as an undrafted free agent in 2011 by the New York Giants and spent time with the Tampa Bay Buccaneers and Cleveland Browns before ending up with the Eagles.
The Colts safety position is up in the air right now, as Antoine Bethea will become a free agent on March 11 and LaRon Landry had a terrible 2013 season. Delano Howell played well and was a good backup, and Sergio Brown was a tremendous special teams guy - although he is also due to become a free agent. Sims was not signed to replace Bethea (should he leave, which is still a big, big if) nor was he signed to replace Landry, and at best he'll provide depth. At worst, he'll be an offseason/training camp member for the Colts, and this is the time of year to sign those guys. Most of the moves made around this time are never bad, as they're all low-risk, high-reward. This is just another one of those, and while I don't see Sims making a huge impact, he could possibly compete for a roster spot in training camp.