In October 2018, she was named in Bangladesh's squad for the 2018 ICC Women's World Twenty20 tournament in the West Indies.[8][9] In August 2019, she was named in Bangladesh's squad for the 2019 ICC Women's World Twenty20 Qualifier tournament in Scotland.[10] In October 2019, she was named in the Women's Global Development Squad, ahead of a five-match series in Australia.[11] In November 2019, she was named in Bangladesh's squad for the cricket tournament at the 2019 South Asian Games.[12] The Bangladesh team beat Sri Lanka by two runs in the final to win the gold medal.[13]
In January 2020, she was named in Bangladesh's squad for the 2020 ICC Women's T20 World Cup in Australia.[14] She was the leading run-scorer for Bangladesh in the tournament, with 114 runs in four matches.[15]
Sultana named captain of the Bangladesh squad for the 2024 ICC Women's T20 World Cup[19] and played her 100th Twenty20 International (T20I) match on 3 October 2024 against Scotland in the opening match of the tournament .[20] She became first Bangladeshi female cricketer to achieve this feat.[21] She was named in the ICC's Best XI for the World Cup. The ICC highlighted her impressive performance, stating, "Nigar Sultana Joty takes the gloves following an impressive competition." She led Bangladesh to their first Women's T20 World Cup win in 10 years against Scotland and made significant contributions with the bat, scoring 39 against the West Indies and 32 not out against South Africa. Joty accumulated 104 runs across four innings at an average of 34.66, but her standout performance came as a wicketkeeper, with six stumpings and one catch, totaling seven dismissals — the most by any wicketkeeper in the tournament.[22]