The Sanghāta was translated into Tibetan in the ninth century CE. A colophon at the end of that translation suggests that there had been an earlier translation, now lost, whose 'language was updated' by the only translation that survives. In general, the Tibetan translators pursued a strategy of producing extremely literal translations from Sanskrit, to the point of using Sanskrit grammatical patterns and one-to-one word correspondence. This makes the Tibetan a valuable resource for study of Sanskrit texts—but at the same time, often difficult to understand, even for well-trained Tibetans.
 
For those with "The Buddha's Word" CD collection from the Tibetan Buddhist Resource Collection, the Sanghātasūtra can be found on CD5/10 in file 22084048 on pp. 453-546 (scan numbers 455-548). Those interested can purchase the entire Kangyur on CD by  contacting TBRC directly at info@tbrc.org.