The 47-year-old actress is the latest entry in the film, which will be directed by Silas Howard, reported Deadline.
Landecker will play Sandra, a patient in Greg Wheeler's (played by Jim Parsons) therapy practice.
The film is based on Daniel Pearle's 'Lincoln Center' play.
It also stars Claire Danes opposite "The Big Bang Theory" star.
The story is set on the eve of the admissions cycle for New York City kindergartens, and Alex (Danes) and Greg Wheeler (Parsons) have high hopes for their son Jake.
The movie also stars Octavia Spencer, Priyanka Chopra and Ann Dowd.
The film is currently underway in New York.
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