Prachuap Khiri Khan: Warning signs in Thai, Chinese and English will be placed on beaches in Hua Hin district, following reports of a Norwegian man being attacked by a shark on Sunday.
Deputy provincial governor, Chotnarin Kerdsom, said he had ordered that the signs be placed on all beaches popular among swimmers.
He also ordered long nets to be laid to demarcate swimming zones.
To prevent another attack, police and lifeguards have been deployed to keep watch at beaches, Mr Chotnarin told reporters after visiting shark attack victim Werner Danielsen, 54, in hospital.
Mr Danielsen suffered tendon damage and received 19 stitches in his left foot following the attack, according to Dr Pongsak Boonyaleephan, assistant to the director of Hua Hin's Bangkok Hospital.
Tourists and swimmers, meanwhile, are being warned against swimming in deep water or at night.
Swimmers are also being told told not to wear swimsuits of a reddish or bright orange colour or ones that resemble fish scales, as these could attract sharks, Mr Chotnarin said.
Tourists were also warned to avoid swimming alone.
The deputy governor also spoke to Phra Khru Boonya Phiram, the abbot of Wat Khao Tao temple, who filmed the rescue of the Norwegian tourist after he was attacked by the shark.
As well as showing a clip of the rescue, the abbot also posted clip of sharks swimming in the sea near his temple.
Mr Chotnarin, said he would send the clips to experts to confirm whether they were bull sharks as the abbot had claimed.
He said Sunday's attack was "rare" since the last such attack was several decades ago.