The expanded line-up features former All Black Bryan 'BeeGee' Williams, athletics' Allison Roe, surf lifesaver Cory Hutchings and football international, Noah Hickey.
"We are extremely fortunate to have such an amazing groups of masters' sports advocates join our ambassadors team to help us tell the World Masters Games 2017 story here and overseas."
Peter Miskimmin, Chief Executive of Sport NZ, said the sports selected provide many options for masters athletes, no matter what age or capability, and truly bring to life the 'sport for all' ethos.
"We expect masters athletes from around the world will enjoy the chance to try some new sports along with the old favourites," Miskimmin said.
Core sports are archery, athletics, badminton, basketball, canoe/kayak, cycling, football, hockey, orienteering, rowing, shooting, softball, squash, table tennis, triathlon and weightlifting.
The 12 optional sports are baseball, golf, lawn bowls, netball, sailing, rugby, surf lifesaving, swimming, tennis, touch, volleyball and water polo.
Two sports - weightlifting and orienteering - will hold their annual World Masters Championships at World Masters Games 2017.
The eight para sports are archery, athletics, canoe/kayak, rowing, table tennis, tennis, lawn bowls and swimming.
With the critical sports selection process complete, the planning team will now turn its attention to the evaluation and selection of the more than 45 venues required to deliver the event.
"We expect to announce the venues, including those for the opening and closing ceremonies, before the end of the year," Wootten said.