The collision occurred around 17:15 on Monday as the motorcyclist travelled up the hill.
Police said that it then collided with two vehicles travelling in the opposite direction down the hill: a silver Mercedes and a white Vauxhall Corsa hire car.
Ambulance and Fire and Rescue officials were called to the area, and the rider was taken to the Emergency Department. His injuries were described as “minor”.
Pictured: The accident was said to have occurred near the top of Beaumont Hill.
No one else was reported to have been hurt.
Police are now seeking more information on how the crash happened, and are calling for islanders who witnessed the incident to come forward.
Anyone who witnessed it or knows more is urged to call them on 612612 or can make an anonymous report via Crimestoppers by calling 0800 555111 or using their online form.