In the 2011 Junior National Championships, Ramanayake made her debut at national level by representing Rajapaksa Central and finished sixth in the Under 18 girls’ 3,000 metres. Later, she started running the 800 metres and won a medal at the South Asian Junior Athletics Championships.[3] For many years, she was second-fiddle to both her seniors and contemporaries before cementing her position in the 400 metre sprint event. At the 2019 Asian Athletics Championships, Ramanayake competed in the women's 4x400-meter race that broke the national record. She qualified for the 2023 Asian Championship and surpassed Menaka Wickramasinghe to become the third fastest woman in Sri Lankan history in the 400m.[4] At the 400 meter event, she finished the race with a timing of 52.61 seconds and won gold. Ramanayake also became the eighth Sri Lankan to win an Asian Championships individual gold medal.[5] At the 47th Sri Lankan National Sports Games held in August 2023, she won gold for both 200m and 400m and also bagged the best women athlete award.[6]
