After the season, he terminated his contract with Keflavík, siting his desire to play overseas.

[5] On 9 August 2019, Gunnar signed with LEB Oro club Oviedo CB.

[10] In August 2022, Gunnar signed with Swedish Basketball League club Fryshuset Basket.

[11] After two seasons in Sweden, Gunnar returned to Iceland and signed with Fjölnir in August 2024.

[14] Gunnar's uncle is former Icelandic national team player Falur Harðarson.