Yes, if you have a valid Tanzania Tourist eVisa, you can visit Zanzibar. There is no Zanzibar eVisa, although nationals of numerous countries can acquire a Tanzania eVisa. This allows the holder to travel throughout Tanzania, including Zanzibar.
When you arrive in Tanzania, whether at the main airport in Dar es Salaam or any other entry point, you will go through immigration and present your passport with the eVisa to the immigration officer. Once you have entered Tanzania, you are free to travel to Zanzibar without any additional visa requirements or procedures.
Zanzibar's shoreline is so diversified that there are many various experiences to be had across the main island, from the bustling culture in the south to tranquil barefoot luxury in the north. Beyond the tall palm palms, pristine beaches, and malachite-colored ocean, there is plenty to see. Zanzibar offers beautiful beaches, historical sites, and cultural experiences that are worth exploring. You can take a ferry or a short domestic flight from Dar es Salaam to reach Zanzibar. Enjoy your visit to Zanzibar and the rest of Tanzania!