Dewi started playing hockey for Whitchurch Hockey Club and after a few years started playing in goal. He worked his way up through the clubs’ men’s side until leaving for university. Dewi played for University of Birmingham at national league level until finishing university and then moving to play for Southgate Hockey Club for a few years, before making the move to his current club Hampstead and Westminster. He has played for Wales from under 16s all the way through to Senior Men’s squad. He made his debut in 2015 playing against Austria, with his hockey highlight so far is playing in the Euro Championships III in 2015 for the men’s senior squad.