Visitors to Taiwan must obtain a visa or authorization in advance, unless they come from one of the visa exempt countries or countries whose nationals are eligible for visa on arrival. All visitors must hold a passport valid for 6 months (except the citizens of Japan who can hold a passport valid for 3 months, and citizens of United States who are only required to hold a passport valid for the entire duration of stay).

Useful links
https://www.immigration.gov.tw/np.asp?ctNode=29990&mp=2 (English version)
https://www.immigration.gov.tw/mp.asp?mp=1 (Chinese version)

Note:
Please note SDGT is not authorized to assist with the VISA process beyond providing the Notification of Acceptance Letter and Invitation Letter (after registration) issued by the SDGT Committee Board. The invitation letter will be issued after the successful registration. Should your application be denied, SDGT cannot change the decision of the Ministry of Foreign Affairs, nor will SDGT engage in discussion or correspondence with the MOFA or the Embassy on behalf of the applicant. The registration fee cannot be refunded when the VISA application of individual being denied.