Sandstrom was sent to AHL Lehigh Valley on Friday, Jordan Hall of NBC Sports Philadelphia reports.
Sandstrom will protect the home crease Sunday against Florida.
Sandstrom will guard the road cage Saturday against the Bruins, Kevin Kurz of The Athletic reports.
Sandstrom allowed three goals on 11 shots in "relief" as part of Saturday's 7-0 loss to the Lightning.
Sandstrom will start at home versus Ottawa on Saturday.
The Flyers recalled Sandstrom from AHL Lehigh Valley on Thursday.
Sandstrom was reassigned to AHL Lehigh Valley on Saturday, Dylan H. Robillard of Brotherly Puck reports.
Sandstrom was called up by Philadelphia on Thursday.
Sandstrom (upper body) was activated from injured reserve and placed on waivers Sunday.
Sandstrom (upper body) was placed on injured reserve Saturday.