According to World History Encyclopedia, the story is adapted from non-Israelite, near eastern myths.

… the concept of a “garden” of a god(s) was a very common metaphor in the ancient Near East of where the god(s) resided. For the narrator of Genesis, the “Garden in Eden” was imaginatively constructed for an etiological (origin or cause of things) purpose, not as a divine residence, but of the first man and woman on earth – Adam and Eve. As generally accepted in modern scholarship, Genesis 1-11 is labeled as the “Primeval History,” which includes mythologies and legends that were very common not just in Israel, but throughout the ancient Near East. These myths and legends are not Israelite in origin but were adapted by the biblical writers for either polemical or rhetorical purposes.