Left-winger Sean Toomey spent the bulk of his playing days in his home state of Minnesota. Toomey spent four years with the University of Minnesota-Duluth where he twice posted 20-goal seasons. After his Senior year, when he scored 26 goals, Toomey made his NHL debut with the Minnesota North Stars.
The North Stars had drafted Toomey in 1983 and placed him in their lineup for a single game towards the end of the 1986-87 campaign. Toomey was unable to notch a point though he did direct two shots on net.
The following year Toomey split his time between the American and International Hockey Leagues but was unable to generate enough interest for a return to the National Hockey League.
In 1988-89 Toomey was on the move again, this time to Finland where he played for Assat Pori. After scoring 14 goals and 27 points in 34 games Toomey retired from the game.