Born and raised in Port Moody, Ken honed his lacrosse skills with the Coquitlam Junior Adanacs from 1985-88.

Initially a Richmond Outlaw draft selection in 1989, Thomas spent 2 seasons in Burnaby and 10 seasons with the Burrards from 1991-2000. This born leader was a crafty playmaker and known for pin-point passing. Thomas came out of retirement to play for the Coquitlam Adanacs in 2001 and won his only Mann Cup ring with the Adanacs. He was voted an all-star five times and was in the top ten of Western Lacrosse Association scoring in five seasons.

In 329 WLA regular season and playoff games, Thomas scored 183 goals and 589 assists for 772 points.