The 21-year-old, of Portmead, Swansea, has been accused of placing an article with intent to cause alarm.
The alleged hoax saw Swansea's Quadrant Shopping Centre evacuated on 24 May - two days after 22 people were killed in the Manchester terror attack.
He was remanded in custody at Swansea Crown Court on Monday. A plea hearing is set to take place on 24 August.
A man accused of planting a fake bomb at a busy shopping centre has appeared in court.