Samoa's Director General of Health, Leausa Dr Take Naseri, announced the case this morning, saying the man is now in the special isolation ward at the Tupua Tamasese Meaole hospital.
The man and his wife had travelled to Samoa two weeks ago on a repatriation flight from Auckland, after arriving there from Melbourne, Australia.
The man had initially tested negative upon arrival but a follow-up test produced the positive result.
His wife, who has tested negative, is also in isolation.