In 2008, he originated the role of Greg in Neil LaBute's play reasons to be pretty for MCC Theater alongside future The Newsroom co-star Alison Pill.

[7] Neil LaBute credits Sadoski for inspiring the critically noted change in tone in reasons to be pretty from the playwright's earlier works saying: "His own thoughtfulness and good heart helped me to not fall back on anything that I had done before.

[9] Sadoski has also been seen on Broadway alongside Ben Stiller, Edie Falco, Jennifer Jason Leigh and Alison Pill in John Guare's The House of Blue Leaves.

[25] AudioFile magazine said of his work: "Sadoski’s matter-of-fact narration of the monster's deeds makes the tale that much more unnerving to hear".

[26] Publishers Weekly agreed saying: "Thomas Sadoski provides smooth, matter-of-fact narration that acts as a counterpoint to the chilling and unnerving story line".