Bo Jackson
No, he is not. Bo Jackson is retired from both Major League Baseball and the National Football League.
Technically Bo Jackson started playing in the MLB first (in 1986), but he didn't play in the NFL until 1991. Deion Sanders, started playing in the MLB in 1989 and in the NFL in 1990. So to answer your question, Deion Sanders played professionally in two sports before Bo Jackson.
Bo Jackson's retirement did not come until after he had recovered from hip replacement surgery and went on to play another year of professional baseball for the Chicago WhiteSox. He retired from all professional sports in 1994 at the age of 32.
Bo Jackson
Bo Jackson football and baseball
NFL
about 25 cents for a base card
Yes
1987-1990.
1983-1992
Bo Jackson played with the Kansas City Royals and the Oakland Raiders of the NFL. He won rookie of the year with the KC Royals