After leaving school, Ashan played cricket for
Bloomfield Cricket and Athletic Club, Combined Provinces, Ruhuna,
Sri Lanka A cricket team, Sri Lanka Cricket Development XI, Sri Lanka Under-19s, Sri Lanka Under-20s School,
Tamil Union Cricket and Athletic Club, Sri Lanka Board Presidents XI. He was Sri Lanka's captain for the
2008 ICC Under-19 Cricket World Cup in Malaysia. He was also a member of the
2006 ICC Under-19 Cricket World Cup squad representing Sri Lanka. Priyanjan also led the Sri Lanka Youth T20 team at SAF Games in Bangladesh in January 2010. He represented Sri Lanka team in Hong Kong Cricket Sixes 2011, a three-day tournament at Kowloon Cricket Club of Kowloon. On 25 July 2014, Priyanjan scored a hundred against Ireland in Sri Lanka A tour Ireland. He hit 111 off 70 balls as Sri Lanka piled up 329 for 8 in fifty overs. Ireland only scored 222 and Sri Lanka won the match convincingly by 107 runs. He also played for the domestic team
Hambantota Troopers in
2016 Super Twenty20 Provincial Tournament. In March 2018, he was named in Dambulla's squad for the
2017–18 Super Four Provincial Tournament. He was the leading run-scorer for Dambulla during the tournament, with 282 runs in three matches. The following month, he was also named in Dambulla's squad for the
2018 Super Provincial One Day Tournament and was the leading run-scorer for the team in the tournament. In August 2018, he was named in Dambulla's squad the 2018 SLC T20 League. In Dambulla's opening match of the tournament, against Kandy, Priyanjan scored 108 runs from 52 balls, with Dambulla going on to win by 18 runs. In March 2019, he was named in Colombo's squad for the
2019 Super Provincial One Day Tournament. In October 2020, he was drafted by the Colombo Kings for the
inaugural edition of the
Lanka Premier League. In August 2021, he was named as the captain of the SLC Greens team for the
2021 SLC Invitational T20 League tournament. In July 2022, he was signed by the
Kandy Falcons for the
third edition of the
Lanka Premier League. ==International career==