Requirements for Entry:
World Health Organization (WHO) card with yellow fever/cholera vaccination when arriving from a yellow fever/cholera infected area (this does not include the U.S.)
The Government of Sudan requires U.S. citizens to:
Obtain an entry visa from a Sudanese embassy before arriving in Sudan.
Present a passport with at least 6 months validity, and an entry visa or entry permit upon arrival at any port of entry in Sudan.
Register at the Aliens Department at the Ministry of Interior within three days of your arrival or risk being fined.
There are two exceptions to this requirement: U.S. citizens possessing a Sudanese national identification document (such as a Sudanese passport or national identification card), and travelers with a sponsor (a business or organization) that has obtained an entry permit for them in advance from the Sudanese Ministry of Interior may apply for an entry visa at Khartoum International Airport.
Visit the Embassy of Sudan website for the most current visa information. Overseas inquiries should be made at the nearest Sudanese Embassy or Consulate.
Travel permits: A permit from the Ministry of Tourism is required for travel more than 16 miles (25 km) outside of Khartoum and can be obtained by your hotel or travel agent. A separate travel permit is required for travel to Darfur. Travel outside of Khartoum for any other purpose must be approved by the Aliens Department at the Ministry of Interior.
Our ability to provide consular services outside of Khartoum, including emergency assistance, is severely limited. Travelers without permits have been detained and arrested (carry multiple copies). You must register with the police within 24 hours of arrival anywhere outside Khartoum.
There are no currency restrictions for entry or exit, but travelers carrying large amounts of U.S. currency have been detained.
Previous travel to Israel: If your passport has an Israeli visa or Israeli entry/exit stamps you will not be permitted to enter.
Exit Visas: You must obtain an exit visa at the Aliens Department before departing the country and pay any airport departure tax, which is not included in your airline ticket fee.
Women and Children: Women and their children, regardless of their nationality, must have the father's consent to enter and exit Sudan - despite the custodial rights granted to the mother by any Sudanese, U.S., or other court. The husbands of women often use this law to prevent their wives and children from returning to the United States. Contact the Sudanese Embassy for more information.
HIV/AIDS Restrictions: Some HIV/AIDS entry restrictions exist for visitors and foreign residents of Sudan. Sudanese law requires a negative HIV test result in order to obtain a work or residence visa.
Information from travel.state.gov on Jan 22, 2018