"Malmö FF will always have a special place in my heart," says Botheim, who won both the Swedish league title and the Swedish Cup with the Skåne team in 2024, his first season at the club.
The 26-year-old has scored ten goals in the Allsvenskan this year, which puts him fifth in the scoring chart.
Viking Stavanger qualified for the Champions League last week, for the first time in the club's history.
