The driver, Sutam Samsri, 25, surrendered to Patong police at Kathu station on Wednesday.
He told police that he had become annoyed when the tourist could not remember exactly where his resort was and he had to keep driving.
Khun Sutam denied using an iron bar to hit Briton Joseph William Damarell but admitted to wielding an umbrella.
He has been arraigned in court over the charge of assault.
Having made a statement to police after being treated at Patong Hospital, Mr Damarell is believed to have left Phuket.