It happened on Wednesday, October 26th at 5:47 p.m. at the store on College Point Boulevard in Jamaica.
Police say an 8-year-old girl stepped away from her mother's side at the store to look at a display of books.
That's when the suspect repeatedly passed by her and grabbed her buttocks.
The suspect is described as a White or Hispanic male, approximately 5'7", slim build, light-skinned with black hair cut into a fade on both sides.
He was wearing a black jacket with a hood, blue jeans and metal-framed glasses.
Anyone with information in regard to this incident is asked to call Crime Stoppers at 1-800-577-TIPS (8477).
You can also submit tips by logging onto the Crime Stoppers website at WWW.NYPDCRIMESTOPPERS.COM or by texting your tips to 274637 (CRIMES) and then entering TIP577.