One passenger, a resident of Dambulla, was killed in the accident, while six others sustained injuries. The injured have been admitted to the Thanamalvila Regional Hospital and the Hambantota General Hospital.
Hospital sources reported that the condition of several of the injured individuals is critical.
Police suspect the accident may have been caused by the driver falling asleep at the wheel.
Further investigations are being carried out by the Thanamalvila Police.