The map and list of volcanoes can be used nicely for your Iceland sightseeing and tour planning purposes.
Here is a list of Icelandic volcanoes:
Active volcanoes toward Iceland's center and north are Tungnafellsjökull, Kverkfjoll, Askja, Fremrinamur, Krafla, and Theistareykjarbunga.
Active volcanoes in the popular west and southwest of Iceland are Snaefellsjökull, Helgrindur, Ljosufjoll, Reykjanes, Krisuvik, Brennisteinsfjoll, Hengill, Hrmoundartindur, Gresndalur, Grimsnes, Geysir, Prestahnukur, Hveravellir, and Hofsjökull.
You can find a larger, printable version of the map of volcanoes in Iceland here.