The phrase "a sole human" is correct and usable in written English.
It can be used to emphasize the uniqueness or singularity of a person in a given context.
Example: "In a world dominated by technology, she felt like a sole human navigating through the digital landscape."
Alternatives: "the only person" or "a single individual".
Yann Martel's Life of Pi (Canongate) is an original and outlandish story about a boy, the sole human survivor of a shipwreck, in company with a zebra, an orang-utan, a hyena and a Bengal tiger.
It tells a single, apparently simple story in linear fashion: a young man, the sole human survivor of a shipwreck, spends many months in a lifeboat in the company of a Bengal tiger.
The documentary's focus, intimate and unwavering, is on Peter Dunning, a 68-year-old farmer and the sole human on a rural Vermont farm.
When the ship in which 16-year-old Pi and his zookeeping family are to emigrate from India to Canada sinks, leaving him the sole human survivor in a lifeboat on to which barge a zebra, a hyena, an orang-utan and a bedraggled, seasick tiger, Pi is determined to survive the impossible.
Yet in this entire cataclysm that so darkened the face of a continent, she was the sole human being who travelled from one side to the other and back again in an effort to end it.
VAR occupies a unique position as the sole human pathogen among the orthopoxviruses.
A pack of wild dogs roamed menacingly, and the sole human inhabitants were an old Turkoman and his family.
Beyro planned to mask the joints between the sections with wisps of plaster the sole human touch on an object that had a resolution of three hundred microns.
Ms. Chuang submitted her name that night, and after the audience voiced its approval for a movie about a kumquat, she was selected as the sole human member of the cast.
When the flood receded, Manu, the sole human survivor, performed a sacrifice, pouring oblations of butter and sour milk into the waters.
