He earned 76 caps for the Sweden national speedway team.

Sjösten also appeared in six individual World Championship Finals with two bronze medals as best result.

Both third places was received after losing race-off heats for silver medal, the first time to Barry Briggs and the second time to Ivan Mauger[4] Sjösten rode for Masarna, Vargarna and Bysarna in the Swedish leagues and for Belle Vue Aces,[5] Wolverhampton Wolves and Bristol Bulldogs in the British League.

An excellent starter, he was renowned for having a 'wild' style of riding with the rear of the bike sliding further out on the bends than is usual and was often considered rough on his opponents.

[6] He retired after his brother Christer was killed in a meeting in Brisbane, Australia in 1979.