It was the second time Simmons has been recognised as the best player in the League in his career. He also won the medal in 2012-13.
The veteran all-rounder polled 16 votes, to edge out Brad Hope (15 votes), at the WA Premier Cricket awards night held at the WACA Ground on April 12.
The crafty left-arm orthodox spinner took out the WA Premier Cricket wicket-taker title with 53 wickets at an average of 14.30 for the season.
The 36-year-old’s highlight of the season came during the Mariners Round 13 victory clash against Mount Lawley where he posted best figures of 7-79.
During this season, Simmons smacked three half-centuries, including an uncharacteristic 60 from 95 balls against Midland-Guildford before Christmas.
Simmons strong leadership was also recognised on the night after he was announced captain of the WADCC Team of the Year.
Simmons led his team to their second First Grade Grand Final in four seasons, but unfortunately fell short to Claremont-Nedlands who were announced premiers.
JP Robbins Medal (2nd Grade): Ryan Done (Rockingham-Mandurah)
Olly Cooley Medal (1st Grade): Craig Simmons (Rockingham-Mandurah)
WADCCI Team of the Year: Jake Carder (Fremantle), Travis Birt (Wanneroo), Brad Hope (Claremont-Nedlands), James Bracey (Rockingham-Mandurah), Christopher Sabburg (University), Craig Simmons (C) (Rockingham-Mandurah), Andrew Bottega (WK) (Mount Lawley), Josh Nicholas (Perth), Jack Cattrall (Wanneroo), Corey Rocchiccioli (University), Liam Stevens (Scarborough) and Chris Prescott (Gosnells)
1st Grade Bowling Aggregate: Craig Simmons (Rockingham-Mandurah)
Kevin Sullivan Silver Cup: Rockingham-Mandurah