Born in Karlskrona, Sandberg began his footballing career with Jämjö GoIF and Lyckeby GoIF before signing with Kalmar FF in 1955.[4][5][6] In 1970, he signed with Åtvidabergs FF with which he won two Allsvenskan titles, two Svenska Cupen titles, and was the Allsvenskan top scorer in both 1971 and 1972.[7][6] In 1973, he signed with German Bundesliga outfit 1. FC Kaiserslautern, where he spent four years and contributed with 60 goals in 118 league games.[8] After a career-threatening knee injury in 1976, he retired from professional football the following year. In 1979, after a new surgery, Sandberg made his footballing comeback and spent the last couple of seasons of his career with his former club Kalmar FF as well as a brief stint with BK Häcken in 1981 before he once again was forced to retire because of his knee problems.[9][10]
International career
Youth
Sandberg represented the Sweden U21 team a total of six times between 1969 and 1972, scoring 3 goals.[11]