You need an embassy visa for Northern Mariana Islands if you have an Indian passport
Visa options for Northern Mariana Islands
Visitor visa
Travelers need a visa to visit Northern Mariana Islands for Business or Tourism. A paper or embassy visa is the only visa available for travelers visiting Northern Mariana Islands. The visa is typically a stamp or sticker added to the passport. Travelers must obtain this visa from a local embassy, consulate or visa center before traveling.