Candidates can register for SAT 2017 in both online as well as by mail. The SAT test is held seven times a year in the US and six times internationally. It is held in the months of October, November, December, January, March, May and June. Also, to check the complete process of registration and the eligibility of SAT exam you can go through the below article and let me know if you face any doubt -

SAT Registration 2017

Hope this helps!!!