Cross-country skiing and Youth Olympic Games Sonja Leinamo began her career as a cross-country skier and participated in several Finnish junior and senior championships starting in 2019. In early 2019, she secured her only national title by winning the pursuit race at the junior championships. In January 2020, the Finnish athlete competed in the
Youth Olympic Games, reaching the quarterfinals in the
sprint event and finishing 24th out of 82 starters. Additionally, she placed 46th in the 5 km
classic race.
Biathlon In the 2020/21 season, Leinamo switched to biathlon and participated in the
Youth World Championships in March 2021. At the beginning of the 2021/22 winter, she made her
IBU Cup debut in Obertilliach, finishing 82nd and 83rd in the individual and sprint races, respectively. However, she competed in only a few races throughout the season. In the following season, the Finn regularly competed at the second-highest level and scored her first ranking points by finishing 23rd in the sprint at
Pokljuka. She achieved the same 23rd-place result in the sprint event at the European Championships. At both junior championships, she did not come close to podium finishes. However, at the season finale in Oslo, she secured her first
World Cup start, finishing 76th in the sprint with three shooting misses. At the start of the
2023/24 season, Leinamo became a regular member of the World Cup team for the first time. At the season opener in
Östersund, she finished 59th in the individual race and, along with
Suvi Minkkinen,
Erika Jänkä, and
Noora Kaisa Keränen, secured 18th place in the relay. In the sprint competition in Lenzerheide, the Finn reached her first pursuit race at this level by finishing 47th in the sprint. A few weeks later in
Oberhof, she helped the Finnish relay team achieve a top-ten finish for the first time. She also performed well in her final
Junior European Championships, winning the silver medal in the sprint behind Lara Wagner. In the following 2024/2025 season, Sonja Leinamo competed in the relay alongside
Suvi Minkkinen,
Venla Lehtonen, and Inka Hämäläinen, with the Finnish team securing 8th place. In the shortened 12.5 km individual race, she finished 54th with four shooting misses, placing outside the points. However, she achieved a new personal best in the sprint, finishing 27th with one shooting miss, earning World Cup points for the first time in her career. In the sprint in
Annecy - Le Grand Bornand, she struggled with five shooting misses, finishing 83rd and missing the pursuit by a wide margin. At the start of 2025, Sonja Leinamo delivered her best performance in the
Oberhof sprint, achieving an 8th-place finish after shooting clean for the first time in her sprint career. ==Biathlon results==