Mark Sanchez was drafted 5th overall in the 2009 NFL Draft. Madden NFL 09 released August 2008 (based on 2007–08 rosters). He is not in the game — rookie classes are finalized months before launch.
Recommendation: If you want the authentic Sanchez experience (Jets, 2009 season, Mark Sanchez commentary), play Madden NFL 10 or 11. Madden 09 is for 2008 football.