 Sinkbeil was drafted by the St. Louis Cardinals in the 38th round of the 2003 Major League Baseball Draft out of Charles Page High School, but he chose not to sign.He attended Missouri State University, and in 2005 he played collegiate summer baseball with the Falmouth Commodores of the Cape Cod Baseball League.He was drafted by the Florida Marlins in the first round of the 2006 Major League Baseball Draft and signed June 16, 2006.