Awards for translating mainstream literature have existed for some time. The Best Translated Book Award is run through the blog Three Percent (named because that’s apparently the proportion of books published in the USA that are translated). Their long list was published last week.
Also in the frame are the Translation Prizes awarded by the Times Literary Supplement in the UK. Their winners were also announced last week. They include a book by Tove Jansson, though not, sadly, one about Moomins.
Although these awards are not specifically for science fiction of fantasy, they do sometimes include books with fantastic themes, and we will keep and eye on them for likely candidates for our awards. If anyone has any specific information about the books listed, please let us know.