Seven sailors and three coaches got the jab before heading to Oman to join the March 25 Mussanah Open Championship, the Asia and Africa Olympic Qualifier.
Two more windsurfing athletes will receive their Covid-19 jab on Thursday ahead of the Oman qualifier. Judo and boxing athletes will be next in line for Covid shots.
Japan's Tokyo Olympic Games are due to be held from July 23 to August 8 this year after being postponed from last year.