The unidentified male entered the Central convenience store on Avenue Road at just gone 21:00 last night (Tuesday).
Island Echo understands that staff were threatened by the masked individual and told to hand over cash and tobacco. They were threatened with a spray bottle of liquid, which they believed to be acid.
With fears of being seriously injured, staff handed over £300 in cash and several pouches of tobacco.
A spokesperson for Hampshire Constabulary has told Island Echo:
“We were called just after 9pm last night (November 19) to a report of a robbery at a store in Avenue Road, Sandown.
“The man stole more than £300 cash and several pouches of tobacco.
“Anyone who saw anything suspicious or with any information about the robbery should call 101, quoting the reference 44190416530”.
No arrests have been made in connection with the incident, meaning the suspect is still at large.
The shop is open for business as normal today.