After all of his accomplishments at the UMD, Sertich took over as head coach for Michigan Tech University from 2000 until 2003. He volunteered as coach at the College of St. Scholastica, which he had for three seasons from 2010 to 2012. He then also volunteered as coach for the U.S. National Sled Hockey Team in 2015 for one season.
Sertich didn't only act as a coach in the game of hockey, as he was also a player for several seasons in the 1960s. He played between 1966 and 1969, and was voted Most Improved Player as a senior. Sertich was a defenseman and suited up in 64 games in his career for the UMD Bulldogs. In those 64 games, Sertich scored two goals and had nine points. He does have the privilege of saying that one of his goals was scored against one of the most legendary goalies to ever play in the NHL, the great Tony Esposito.