Wills said she was delighted to take on the job in New Zealand's toughest netball league with the country's newest team.
"It has been an ambition of mine to guide a team in the ANZ Premiership and it's exciting to do that with the newest one in the league," she said.
"I enjoyed watching New Zealand's best players go head-to-head each week and now it's my challenge to get the best out of the Northern Stars on a regular basis."
Wills will not start her role with the Northern Stars until December 1 and she will continue preparations with New Zealand's Fast5 Ferns for the World Netball Series where they will aim to defend their title in Melbourne in October.
As a player she represented the New Zealand under-21 side, played for Auckland and was also captain of the Diamonds before ending her career on court with the Waikato-BOP Magic.
The confirmation of Wills as coach will help the Stars in their recruitment campaign. The Auckland side, which was established just a year ago, have lost two key defenders in Leana de Bruin, who will play out her final season in Adelaide next year, and Sulu Fitzpatrick, who is making the shift south to the Pulse.
Given Wills has a strong relationship with the under-21 players, her involvement with the Stars programme will ensure they hold onto their brightest young players.