Goodwin Games - from How I Met Your Mother execs Carter Bays, Craig Thomas and Chris Harris - follows three estranged siblings who must reunite to inherit their father's fortune.
Foster will play the series regular role of Lucinda, the childhood sweetheart of Henry (Scott Foley), according to TVLine.
The Weeds actress replaces The Social Network's Felisha Terrell, who played the role in the original pilot.
Her past TV credits include Fox's 2006 to 2010 sitcom 'Til Death, Royal Pains and Franklin & Bash.
She was also attached to star opposite Chuck's Zachary Levi in Fox comedy pilot Let It Go, but the project was not picked up to series.
Goodwin Games will premiere in 2013, airing on Tuesday nights on Fox.
> TJ Miller to join cast of The Goodwin Games?
Watch the trailer for Goodwin Games below: