Jones, also the Riders' general manager, was honoured at the league's awards banquet.
Voting was conducted by the Football Reporters of Canada and nine CFL head coaches.
In his third season with the Riders, Jones led the franchise to a 12-6 record and second-place finish in the West Division. That matched the most victories for the franchise since 1970 and also earned Saskatchewan its first home playoff game since 2013.
Jones was the architect of a Saskatchewan defence that scored the most touchdowns in franchise history (11) and led the league in opposing net offence (317.5 yards per game), forced the most two-and-outs (107), and tied for fewest sacks allowed.
Coach Jones led the Roughriders to 12 victories this season, matching the most since 1970. He becomes the fifth Rider to win the honour and first since Corey Chamblin in 2013.
(The Canadian Press)