The alleged assault and attempted abduction of a young girl at a North-West campground was a "random" and "extremely concerning" incident, police say.
Detective Inspector Shane LeFevre said about 50 people were at Montagu campground about 5.15pm on Sunday when a car reportedly drove away at speed.
"The witnesses that were there only saw a vehicle leave the scene at speed and that is when they have contacted police when the young child couldn't be located on the beach area," he said.
"We believe this is a random incident, but it is extremely concerning for the police and for the Tasmanian community."
A 41-year-old Rosebery man was arrested in bushland 5km north of Arthur River towards Marrawah at 4.15pm on Monday.
Detective Inspector LeFevre said the primary school aged girl sustained some bruising and was attended to at the Smithton Medical Centre.
"This is a one-off incident. Our thoughts are with the young child and the family. We are extremely concerned with her and the family's welfare," he said.
"We have detectives with the family and they are talking with the family and the young girl to try and ascertain some further details about what occurred."
Detective Inspector LeFevre said it was a timely reminder for a conversation about strangers.
"It is a good reminder for parents to have that conversation with their children about talking to strangers and to be aware of who is about," he said.
If you have information call the Burnie Criminal Investigation Branch on 131 444 or report anonymously to Crime Stoppers on 1800 333 000.