He played one season in Major League Baseball for the 1945 Boston Red Sox, primarily as a third baseman. Tobin also had a long minor league baseball career, playing in the minors from 1942 until 1957. He played in the Pacific Coast League from 1948-1957, mostly as an outfielder.
Johnny"s brother Jim Tobin was a major league pitcher from 1937-1945.
He is interred at Holy Sepulchre Cemetery, Hayward.