The son of the composer Kazimierz Sikorski, he studied at the Warsaw Conservatory with Zbigniew Drzewiecki.
Later, thanks to a scholarship from the French government, he studied in Paris with Nadia Boulanger.
From 1975–76, as a recipient of a Senior-Fulbright Scholarship from the US government, he worked at the Columbia-Princeton Electronic Music Center in New York City.
In addition to piano works and radio opera, Sikorski composed numerous instrumental works, among them: In 2013, Bolt Records released a 2 disc album, V/A Solitude of Sounds – in memoriam Tomasz Sikorski featuring the work of Sikorski, as well as composers Szabolcs Esztényi and Kasia Glowicka.
Within the album's release, Glowicka wrote of the composer: "Sikorski's minimalism was unique to any of these native and foreign influences.