I don't think you can make that case. They primarily sponsor Hezbollah which is not really in the business of terrorism. They're content with their power base in Southern Lebanon, but they don't routinely cross the border with Israel to commit acts of terrorism against Israeli citizens. There were border skirmishes between Israel and Hezbollah in the early 2000s; in one of them, Hezbollah managed to capture a handful of Israeli soldiers, which was the stated reason for the outbreak of the 2006 Lebanon war, but I'd not classify that as terrorism. They're also not in the business of sponsoring or committing terrorist acts worldwide.
Hamas is very much the same story; the only thing different is that they routine lob missiles from Gaza into Israel, which you may classify as terrorism. But at the moment, Iran doesn't even sponsor Hamas.
The Yemeni insurgents that are sponsored by Iran also only have national goals in the Yemeni civil war.
The only exceptions that I can come up with to the above are an attack on a Jewish cultural center in Buenos Aires some 30 years ago which is strongly suspected to be the work of Hezbollah and Iran; and possibly Lockerbie, which would have been in retaliation to the USS Vincennes incident. But those are long ago, atypical and there are no more recent examples.
When I go to the supermarket, I run the slight risk of being the victim of a terrorist attack by an ISIS fanboy or an AQ fanboy, but not in the slightest by an Iranian-sponsored terrorist.