A woman in her 40s from Poole is recovering after being approached from behind by a man on Princess Road and dragged into the park.
It is reported that a second man held the victim down, but the men were disturbed by a loud noise from a car and ran away from the scene.
A brown suede handbag was stolen, which included a purse, bank card, cash and a pair of sunglasses.
The victim sustained injuries to her face and chest during the incident. Her injuries are not believed to be serious.
It happened at around 8pm on Wednesday 2 June 2021 and officers are appealing for witnesses or anyone with information to come forward.
Police Constable Sarah Hodgson, of the Priority Crime Team, said: “This was a very frightening incident for the victim and we take reports of violence of this nature very seriously.
“I am appealing to anyone who was in the area at the time and witnessed what happened, or any motorists who were in the vicinity and may have captured anything of relevance on dashcam, to please get in touch.
“I would also urge anyone who witnessed any suspicious activity involving two men around the relevant time or leading up to the incident to come forward.
“Finally, I would like to hear from anyone who may have located any of the stolen property discarded in the nearby area.
“Officers will be carrying out patrols over the coming days and can be approached by members of the community with any concerns.”
Anyone with information is asked to contact Dorset Police at www.dorset.police.uk, via email 101@dorset.pnn.police.uk or by calling 101, quoting occurrence number 55210087592. Alternatively, to stay 100 per cent anonymous, contact the independent charity Crimestoppers online at Crimestoppers-uk.org or call freephone 0800 555 111.