Prior to his professional career, Morin spent four seasons with Rimouski Océanic in the Quebec Major Junior Hockey League (QMJHL), where he helped lead the team to a President's Trophy win in 2015.

Morin made his professional debut with the Flyers' American Hockey League (AHL) affiliate, the Lehigh Valley Phantoms, in the following season.

[3] In the 2010–11 season, Morin played for the Lévis Commandeurs of the Quebec Junior AAA Hockey League.

[4] He played left wing for the 2011–12 season, scoring eight points in 62 games with the Océanic, but quickly made the switch to defenceman.

[7] On September 17, 2013, Morin signed a three-year, entry-level contract with the Flyers,[8] but was returned to the Océanic to play the 2013–14 season in the QMJHL.

He was recalled to the Flyers for the March 25 game against the New York Rangers, in which he fought Brendan Lemieux and received a $3,017.24 fine for unsportsmanlike conduct.