Rashmika Sewwandi Hewalanka Geeganage (born 21 October 2006, known as Rashmika Sewwandi) is a Sri Lankan cricketer who plays for the Sri Lanka women's cricket team as a left-hand batter and right-arm fast bowler. She has also played for Sri Lanka women's under-19 cricket team.
In January 2023, Sewwandi was named in Sri Lanka's squad for the 2023 Under-19 Women's T20 World Cup.
In June 2024, she was named in Sri Lanka national team for the series against the West Indies. In September 2024, she named in under-19 squad for the Tri-Series against New Zealand under-19 and Australia under-19 team. She scored unbeaten 36 and took two wickets against New Zealand under-19 cricket team and Sri Lanka under-19 team registered 69 run victory over New Zealand.
In December 2024, she was named in under-19 squad for the 2024 ACC Under-19 Women's T20 Asia Cup. In January 2025, she also named in national under-19 cricket team squad for the 2025 Under-19 Women's T20 World Cup, as vice-captain of the side. She played four games in that tournament.
In February 2025, Sewwandi named in ODI and T20I squad for the series against New Zealand. She made her T20I debut in the same series on 18 March 2025. In April 2025, she was named in Sri Lanka national team for the ODI Tri-Nation series against India and South Africa.