In 1961, McNab became general manager and coach of the San Francisco Seals of the WHL. He was then coach of the WHL's Vancouver Canucks and in 1966 was hired as coach and general manager of the San Diego Gulls. He rose in the front office to vice-president by 1971. In 1974 he was named president of the Central Hockey League. Although he would only remain with the CHL for a year, the Max McNab Trophy, awarded to the most valuable player in the league's playoffs, would be named in his honor.