Modin, with Emil Jönsson Haag as guide, was only defeated by Chinese Yu Shuang in the sprint final.
Last season, Modin was stopped by a hip injury for large parts of the season. After reducing competition and training to focus on rehabilitation, the 30-year-old now seems to be heading towards a more enjoyable season.
It went better than we thought and I started feeling that it's fun to ski when you're not in pain. Today it feels fun, he said in an interview with Dagens Nyheter ahead of the World Cup premiere.
Late on Tuesday, alpine skier Ebba Årsjö took revenge in French Tignes after missing out in Monday's World Cup slalom, when she crashed out. Now the opponents were helpless as Årsjö took her fourth win in five competitions this season. The 23-year-old Swede was over nine seconds ahead of second-placed Aurélie Richard from the home team.
Aaron Lindström, who came second on Monday, crashed out in Tuesday's slalom.
Corrected: An earlier version had the wrong weekday. Correct is that the competitions took place on Monday and Tuesday, respectively.