You may need a visa for Tunisia if you have an Iranian passport
Visa options for Tunisia
Visitor visa is required for trips longer than 15 days for Tourism
Travellers need a visa to visit Tunisia for Tourism for more than 15 days. Travellers do not need a visa if staying for 15 days or less. A paper or embassy visa is the only visa available for travellers visiting Tunisia for more than 15 days. The visa is typically a stamp or sticker added to the passport. Travellers must obtain this visa from a local embassy, consulate or visa center before travelling.
This is not offered by sherpa°.
Apply on the government site.