[1][2] Sundström's British speedway career started in 2009 with Rye House Rockets and he top scored for them during 2010 while also earning ten rides for Ipswich Witches in the higher division.

In the World Cup Final he scored 4 points; the team consisted of Andreas Jonsson, Fredrik Lindgren and Antonio Lindbäck.

[6] In 2018, Sundström returned to British speedway after signing for Poole Pirates for the SGB Premiership 2018 season but was replaced mid-season.

He fractured his left thigh in two places, broke his upper arm and shoulder joint and tore his liver.

After recovering from the injury he signed for Västervik Speedway but then in May 2021 suffered another serious crash while riding in the Danish league.