Schoon then played professionally in the BAA, NBL, NBA, and NPBL as a member of the Anderson Packers, Detroit Falcons, Flint Dow Chemicals, Sheboygan Redskins and Denver Refiners.

He platooned with Noble Jorgensen at center and played in all 62 games for the Red Skins that season, averaging eight points and shooting a team-best 41 percent from the field.

The Red Skins advanced to the NBA playoffs where they nearly eliminated the Western Division champion Indianapolis Olympians in a best-of-three series.

He set a professional basketball scoring record with 64 points in a 99–72 victory over the Kansas City Hi-Spots on Jan. 21, 1951, at the Denver Auditorium.

The Frontier-Refiners compiled an 18–16 record, but the team moved to Evansville late in the season and Schoon's professional career ended.