Finnsnes is easy to reach by plane Bardufoss airport from Oslo. Several catamarans depart for Harstad and Tromsø daily. There is also a catamaran connection nine times a week to Lysnes Northern Senja with onward bus connections from Tromsø. From Skrolsvik on the southern tip of Senja, there is a catamaran connection to Harstad.
In summer, convenient car ferries (http://www.senjafergene.no) go from Brensholmen near Tromsø to Botnhamn in northern Senja. From Gryllefjord there is a car ferry to Andenes at the northern tip of Vesterålen.