At the 1896 Summer Olympics, Sjöberg competed in five different events, one on the athletics track, three in the athletics field and one as a gymnast, on the track he competed in the 100 metres, his time is unknown and records only show he finished in fourth or fifth place in his heat so didn't qualify for the final. In the athletics field he competed in the discus, his distance is unknown and finished outside the top four, in the long jump, again his distance is unknown and was placed outside the top four, his best result was in the high jump where he cleared 1.60 metres to finish in fourth place just 5 centimetres short of a medal.