Sunday has represented the Nigeria women's national football team at junior levels, being in the squads of the 2010 FIFA U-20 Women's World Cup (competition Runners-Up) and 2012 FIFA U-20 Women's World Cup. At senior level she was part of the squads for the African Women's Championship tournaments in 2010, 2012 and 2014, winning it twice in 2010 and 2014. She was also a member of the team which took part in the 2015 FIFA Women's World Cup, but did not progress past the group stage.