Sika is from Haveluloto, and was educated at Brigham Young University–Hawaii, gaining a Bachelor of Science.

[1] Before entering politics he worked as a teacher and travel agent,[1] and ran a takeaway shop and catering firm.

[3] In 2007 he was one of three people, including Human Rights and Democracy Movement leader ʻAkilisi Pōhiva, who were prosecuted for their leadership of a protest march in June 2006.

[7] in July 2019 there were calls for his resignation after he intervened to silence a speech against bullying and sexism at the Miss Pacific pageant in Tonga.

[8][9] He became acting premier following the death of Prime Minister ʻAkilisi Pōhiva on 12 September 2019.