[1] She has competed in several international competitions including the AIBA Women's World Boxing Championships in 2012, 2014 and 2016.

Anusha Koddithuwakku rose to prominence at the international boxing arena after securing a silver medal in the women's 48kg fly lightweight event during the 2016 South Asian Games losing to veteran Indian boxing world champion Mery Kom.

She started the tournament well with reaching the semi-final round and was scheduled to face her arch-rival Mery Kom who is 35 years old in the semifinal again after the 2016 South Asian Games final.

[2][3] During the semi-final clash on April 11, Mery Kom managed to beat Anusha Koddithuwakku comfortably 5–0 to secure a final round berth.

She too became the first Sri Lankan woman boxer to clinch a Commonwealth Games medal in boxing.