In 2015 and 2016, as well as 2018 and 2019, Sugandhi was Sri Lankan champion in the heptathlon and in 2018 and 2019 also in the 100-meter hurdles and in 2019 also in the 100-meter run.
Personal best
100 meters: 11.84 s (−0.8 m / s), December 3, 2019 in Kathmandu
100 m hurdles: 24.47 s (−0.7 m / s), December 5, 2019 in Kathmandu
Heptathlon: 5128 points, August 18, 2019 in Colombo