Thomsen became champion of Denmark, winning the
Danish Championship in 2020. and
Peterborough Panthers. In 2020, he won a bronze medal at the
2020 Speedway of Nations and in 2021, he won the Danish title for the second time and was awarded a permanent wildcard for the
2021 Speedway Grand Prix. He eventually finished in 14th place during the 2022
Speedway World Championship, after securing 51 points, which included winning the Gorzów Grand Prix but another injury (a broken leg in the
GP Challenge curtailed his season and he was unable to compete in the final four Grand Prix events. Despite the latest injury Thomsen was selected as a permanent rider for the
2023 Speedway Grand Prix. Also in 2022, he helped
SES win the
2022 Danish Super League. In 2023, he was part of the Danish team that won the bronze medal in the
2023 Speedway World Cup final. During the 2023 Latvian Grand Prix, Thomsen remarkably avoided serious injuries despite being thrown over the air fence in a crash. He suffered a hand injury which required an operation and he missed the final three rounds of the
2023 Speedway Grand Prix. In 2024, he helped Denmark reach the final of the
2024 Speedway of Nations in Manchester. Thomsen ended his 2024 season by qualifying for the
2025 Speedway Grand Prix by finishing second in the
2025 GP Challenge. In 2025 he finished 11th in the
World Championship. == Major results ==