Sophie Cellier attended the Cours Florent in Paris, from which she graduated in 2024. She received the Prix d'interprétation féminine at the Prix Florent Image 2025 for her role in "Démasquée", a short-film she wrote which also won best Film & Best scenario at the Jacques 2025. Having lived and worked in Australia for six years, she has solid experience as an actress in English. She is also a graduate of the 16th Street Actors Studio in Melbourne. She has worked with director Ian Sinclair (Melbourne Theatre Company) and director Scott Major (Darkland).

She is trained in classical dance, modern jazz, and singing. At the start of the 2023 season, Sophie has held one of the leading roles in the play "Jardins Nocturnes" by Odette Branco at the Théâtre Clavel, a show that combines singing, contemporary dance, and theater. In November 2026, she will be playing Stella in "The Collection" by Harold Pinter, directed by Christophe Daci.