[1] Born in Port Moresby to a Papua New Guinean mother and a New Zealand father, Soper grew up on the New South Wales Central Coast.

[5] On 28 May 2016, Soper took his first five-wicket haul in a List A game in the match between Papua New Guinea and Kenya in the 2015–17 ICC World Cricket League Championship.

[11] In March 2019, he was named in Papua New Guinea's squad for the Regional Finals of the 2018–19 ICC World Twenty20 East Asia-Pacific Qualifier tournament.

[12] The following month, he was named in Papua New Guinea's squad for the 2019 ICC World Cricket League Division Two tournament in Namibia.

[14] In September 2019, he was named in Papua New Guinea's squad for the 2019 ICC T20 World Cup Qualifier tournament in the United Arab Emirates.