Sharun was selected by the Edmonton Eskimos in the sixth round of the 2010 CFL draft before that year's season with the 43rd overall pick. The Eskimos signed Sharun to a three-year contract with an option for a fourth year on May 4, 2010.[5]
Sharun participated in training camp with the Eskimos in 2010 and practiced with the first team as a safety, but was moved to the practice squad when the team was reduced to 46 players.[6] The Eskimos went on to transfer Sharun between the active and practice rosters several times throughout the year.[7] He made his CFL debut on July 11, 2010, against the Montreal Alouettes, and later recorded his first special teams tackle on August 6 against the Toronto Argonauts.[1] In a game against the Saskatchewan Roughriders on August 28, Sharun blocked a punt to set up the Eskimos' only touchdown along the way to scoring 17 unanswered points to win 17–14.[8] In his rookie season, Sharun recorded 16 special teams tackles while playing in 15 regular season games, along with one defensive tackle.[9]
Sharun played in all 18 games throughout the regular season of 2011.[1] Cementing his role as a special teams player, Sharun made 25 special teams tackles in the regular season, tying the team's single-season record previously held solely by Bruce Dickinson. His franchise record was later broken by Deon Lacey in 2014.[10] He recorded the second highest total of special teams tackles in the CFL, leading the West division in that category.[11] Playing against the Hamilton Tiger-Cats on July 9, 2011, Sharun recorded a career-high four tackles. He made one special teams tackle during the playoffs.[1] The Eskimos finished the season with a winning record of 11–7 and finished second in the West division. The Calgary Stampeders lost the West Finals to the BC Lions, eventual Grey Cup champions. Sharun was active in both playoff games.[1]
Sharun played in 13 regular season games and registered 13 special teams tackles during the 2012 season.[1] He was placed on the six-game injured list in October.[12] In a September 7 game against the Stampeders, Sharun caught an unlikely pass from third-string quarterback and holder Matt Nichols following a failed field goal snap and ran 35 yards for both players' first career touchdown.[1][13]
In the 2013 CFL, Sharun played in 11 games and recorded 14 special teams tackles,[9] including three total tackles in the September 6 game against the Stampeders.[1] He began the season on the practice roster after being cut when the Eskimos reduced their roster to 46 players,[14] but returned to the active roster on July 12.[15]
Sharun achieved nine special teams tackles over 13 games during the 2014 season. He also played in two playoff matches, recording an additional tackle.[1] Sharun was placed on the injured list several times during the 2014 season, including a transfer to the six-game injured list in September.[16][17] Following the 2014 season, Sharun was signed to a contract extension by the Eskimos[18] but was released prior to the start of the regular season in 2015.[19]
The Calgary Stampeders signed Sharun to their practice roster on July 28, 2015, where he remained for most of the season.[20] He was activated for the West Final following an injury to Karl McCartney.[21] In a loss at the West Final, Sharun made three special-teams tackles against his former team, the Eskimos.[22] On June 19, 2016, Sharun was released by the Stampeders.