He started his youth career in
Lura, but later joined the city's major team
Sandnes Ulf. He made his senior debut in 2014. He finished the
2017 First Division season with 11 goals and 10 assists. He made his Eliteserien debut on 9 April 2018 against
Lillestrøm. In January 2021,
Viking tried to sign Sandberg, but Haugesund did not want to sell him. One year later, in January 2022, Viking succeeded in their attempt to sign Sandberg. He signed a four-year contract with the club. On 12 March 2022, he made his debut for Viking in a 2–0
cup win against Kongsvinger. One week later, Viking won 5–0 against
KFUM Oslo and Sandberg scored two of the goals. ==Personal life==