Prior to turning professional, Sinkewich attended Bowling Green State University where he played four seasons of college hockey with the NCAA Division I Bowling Green Falcons men's ice hockey team.

He was again loaned to the Abbotsford Heat impressing in 21 games to be signed to an AHL contract by the Bridgeport Sound Tigers on February 29, 2012, for the remainder of the season.

[2] Unable to attract AHL interest for the following season, Sinkewich returned to re-sign with the Alaska Aces for his third consecutive year.

He scored 3 goals in 11 games with the Gladiators before he attracted the interest of the Portland Pirates of the AHL where he remained for the duration of the year.

[4] In the following off-season, Sinkewich's ECHL rights were initially traded by the Gladiators to the San Francisco Bulls on June 10, 2013.