Radiator will take over the account from Octopus Group.
The appointment has been made to complement the electronics brand’s latest six-month creative brand-building campaign.
The account’s social media, events and PR campaigns will be led in tandem by the firm’s account director DK Cheung and its head of digital, Scott Cable.
Goodmans hopes that the collaboration with Radiator will help to deliver the latest iteration of its product range with a new identity in the UK as well as abroad.
Christian Corney, commercial director at Goodmans, said: "Our aim is to export this new brand identity internationally, and with Radiator’s strong history and experience in youth culture and marketing, it is ideally placed to deliver the brief."
Radiator also secured a contract with Brazilian footwear brand Ipanema Flip Flops earlier in the year.