Sanna Vaarni began her studies at the Espoo Music Institute with professor Katarina Nummi-Kuisma. She studied in Sibelius Academy with professor Eero Heinonen, chamber music with Ralf Gothóni and lied music with Gustav Djupsjöbacka. Supported by a grant by Wihuri Foundation, she spent 1997-1999 in Paris studying with professor Konstantin Bogino.
Sanna Vaarni has been a prize winner in many national piano competitions (Ilmari Hannikainen Piano Competition, Helmi Vesa Piano Competition, Fazer Piano Competition). She performs regularly as a soloist, chamber musician and lied pianist. She has given concerts in Italy, Estonia, France, Germany, Latvia and in Saudi Arabia. She has been recording for the Finnish Broadcasting Company (YLE).
Sanna Vaarni has recorded piano music of Leoš Janácek on July 2018 with Heikki Savolainen at Järvenpää-Talo, Finland. The record was published by EMAVinci Records in August 2019.
On November 4, 2022 her CD ”Illustrazioni – 20th Century Italian Piano Music” was released by Stradivarius Music Label (STR 37214). The CD was recorded and produced by Heikki Savolainen.
Currently Sanna Vaarni works as a Senior Lecturer in Piano and as a Head of Piano Department at the Espoo Music Institute, the leading music school in Finland. During the recent years she has been giving master classes in music institutes and conservatories in Finland, Italia (Conservatorio Santa Cecilia, Rome), China (Beijing Central Conservatory of Music, Ningbo International Institute) and in Europe.