[5][6] On 3 July 2022, he became the first South Asian to break the 10-Second barrier for the men's 100 meters event at the Resisprint International competition, with a timing of 9.96 seconds, in La Chaux-de-Fonds, Switzerland.

[12] On 22 May 2022 at a meeting held at the Stadio Zecchini, Grosseto in Italy he won the men's 200 meters event setting a new national record of 20.37 seconds.

[13] On 25 May 2022 at an event held at the Paul-Greifzu-Stadion, Dessau in Germany he won the men's 100 meters setting a new national record of 10.06 seconds.

[17] Abeykoon represented Sri Lanka at the 2013 South Asian Junior Athletics Championships which was held in Ranchi and finished fourth in the men's triple jump competition.

Abeykoon competed at the 2015 Military World Games representing Sri Lanka and took bronze medal in men's 4 × 100 m relay event.

Abeykoon also represented Sri Lanka at the 2019 South Asian Games and claimed gold medal in the men's 4 × 100 m relay event.

[29] On 13 May 2021, he renewed his own personal as well as the national record for men's 100m event by clocking at 10.15 seconds which he set during the Meeting di Savona Championship in Italy.

[30][7][31] In the same month, he bettered his own personal record in the men's 100m event by clocking at 10.09 seconds which he achieved in the 100m final at the Anhalt 2021 competition which was held in Dessau, Germany.

[45] On 31 July 2021, he completed his 100m race with a timing of 10.32 seconds in the Tokyo Olympics and was ranked sixth in the heat event and thus failed to qualify for the next round.

[49] In September 2021, Abeykoon competed in the Weltklasse Zürich which was part of the 2021 Diamond League, and was placed at ninth position with a timing of 10.25 seconds in the men's 100m final.

[53] On 24 April 2022, Abeykoon broke the Asian record in the men's 150m event with a timing of 15.16 seconds to claim gold medal in the Perseo Trophy which was held at the Stadio Raul Guidobaldi in Rieti, Italy.

[58][59] On 25 May 2022, he competed in the Anhalt 2022 International Meet which was held at the Paul-Greifzu-Stadion in Dessau, Germany; he won the men's 100 meters setting a new national record of 10.06 seconds.

[71][72] Abeykoon also became the first Sri Lankan sprinter in 13 years after Shehan Ambepitiya to compete in the men's 100m at a World Athletics Championship.

[69] On 3 August 2022, Abeykoon won the bronze medal in the men's 100m final at the Birmingham Commonwealth Games after finishing the race in 10.14 seconds.