The Gavin & Stacey actress will appear alongside Miranda's Tom Ellis in the show, The Daily Telegraph says.
The comedy, which is called The Gates, focuses on the rivalries between parents on the school run.
Page is expected to play one of the mothers.
"She is incredible," Ellis said. "Just such a sweet, kind-hearted woman. It's sort of based on a family and I play the dad."
Since leaving Gavin & Stacey, Page has had roles in shows including Bedlam and White Van Man. Meanwhile, Ellis recently finished filming for BBC Three's upcoming supernatural drama The Fades.
> TV Heaven & Hell: Joanna Page