Yes. Use the Library's catalog and choose Advanced Search. In the search query box type in science fiction, next select all of these from the drop down menu to the right and finally choose subject from the next drop down menu. This should give you all the books classified as science fiction. When you are in a record, click SHOW FULL RECORD, the subject headings there will be more refined. You can click on this link to find different subject headings pertaining to science fiction, such as Science Fiction - History and Criticism, or Science Fiction - Stories, plots, etc.
I've provided you with links to a tutorial on Using the Catalog and the Library Catalog.