On 12 February 2016, Aron signed a three-year contract with Norwegian Tippeligaen side Tromsø IL.

[3] On 16 December 2019 Sigurdarson signed a 2,5 year contract with Belgium side Union SG.

On 9 August 2021, Sigurðarson joined Danish 1st Division club AC Horsens on a deal until June 2024.

[4] In January 2024, Sigurðarson returned to his homeland, signing with KR Reykjavík.

[5] Aron made his debut for Iceland on 31 January 2016, in a friendly match against the United States in California, during which he also scored his first goal for his country.