In my survey of Buddhistic science fiction, I should have included the legendary Dune by Frank Herbert, published in 1965. I remember my younger brother was enthralled with Dune and read several books in the early series. Like many science fiction novels of the 60s, it was filled with references to 60s counter-culture, in this case, futuristic religions situated in Arabic desert cultures and languages, and Zen spiritual beliefs and practices.
From Wikipedia:
Early in his newspaper career, Herbert was introduced to Zen by two Jungian psychologists. Throughout the Dune series and particularly in Dune, Herbert employs concepts and forms borrowed from Zen Buddhism.
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