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Šeibelis was born in the provincial town Sabile. In 1922 he joined the newly founded Rīgas FK which later became the dominant Latvian football club of the 1920s-30s. In RFK Šeibelis for a long time had to play with the reserves squad, however in 1925 he made his debut with the Latvia national football team which was looking to include more young players. In his first years Šeibelis more played as a forward but later he became a central midfielder. He organized both the defense and attack, and also scored goals. He was considered one of the best footballers of the Baltic States for several years. In 1928 Šeibelis was on the Latvian team which won the first Baltic Cup, in the decisive match against Estonia he organized the winning goal and was injured by a frustrated Estonian forward who couldn't go past Šeibelis. In 1936 when Latvia won another Baltic Cup scored a winning goal against Lithuania in the last minute.
In his club career in 1931 Šeibelis left Rīgas FK and joined V.Ķuzes FK and Rīgas Vilki (he played with both clubs at the same time for several seasons). In 1938 Šeibelis with Rīgas Vilki won the Latvian Cup - a huge success for the club which wasn't among the elite of Latvian football. In 1939 he played his last international match for Latvia as it lost 0:3 to Bulgaria.
- Champion of Latvia - 1925, 1926, 1930
- Latvian Cup winner - 1938
- Ivars Ošiņš. Golden 100 of Latvian sports