A former US Olympian in dressage allegedly shot a woman at his upscale New Jersey equestrian facility — and is expected to face charges imminently, sources told The Post on Thursday.

Michael Barisone, who took part in the 2008 games in Beijing, allegedly shot the woman multiple times on the sprawling grounds of tony Hawthorne Farm in Long Valley on Wednesday afternoon, leaving her hospitalized, sources said.

The condition of the woman, whose name was not immediately released, is “up in the air,” one source told The Post.

The exact details of what motivated the 2:15 p.m. shooting on the 53-acre expanse — home to Barisone Dressage — weren’t immediately clear, but sources characterized it as a tenant/landowner dispute.

Barisone — who was named the 2009 Sportsman International Horseman of the Year, and has gone on to train more recent Olympians — is in police custody and expected to be charged within a matter of hours, sources said.

Barisone and another person, not immediately identified, were also injured in the incident, though neither was shot.

It was not immediately clear if Barisone had retained a lawyer, and he could not be reached for comment.