Coulson played hockey recreationally in the Ottawa Senior leagues where he earned a reputation as one of the nastiest and dirtiest players. A stay-at-home defenseman, Coulson was invited to the Philadelphia Quakers camp in 1930 and made the team. He played in 28 games, but scored no points. He did tally a surprisingly high 103 PIM that season though!
The Quakers franchise bit the dust with the Great Depression setting in. The players were dispersed and Coulson was claimed by the Montreal Canadiens. However Coulson never reported to Montreal, and did not play anywhere competitively for the next three years.
He did resurface in the Ottawa Senior leagues by mid-decade. By then it was believed he had joined his dad in the hotel business.