Career
After being awarded "" in the Icelandic Úrvalsdeild with Víkingur, he signed for Norwegian side Lillestrøm in 2006, but was loaned to KR Reykjavik for the 2008-season, and then went back to Lillestrøm after the season. In 2009 he signed a one-year contract with Nybergsund Illinois-Trysil in the Norwegian Adeccoligaen following his spell in Sweden. After being released from Nybergsund Illinois-Trysil, Arnarsson went back to Iceland to play for KR Reykjavik and Fram Reykjavik before ultimately returning to his home club Víkingur.
Viktor previously played for TOP Oss in the Dutch Eerste Divisie.