[5] In October 2021, Gunaratne was selected in Sri Lanka's squad for the 2021 Women's Cricket World Cup Qualifier, but did not play a match.

[6] Gunaratne made her Twenty20 International debut on 18 January 2022, at the 2022 Commonwealth Games Cricket Qualifier against Scotland, opening the batting and scoring 8 runs.

[10] Gunaratne was selected as part of Sri Lanka's squad for the 2022 Commonwealth Games, playing two matches in the tournament.

[11][12] In January 2023, Gunaratne was named in Sri Lanka's squad for the 2023 ICC Under-19 Women's T20 World Cup, as captain of the side.

[14] In February 2023, she played four matches for Sri Lanka at the 2023 ICC Women's T20 World Cup, scoring 60 runs.