The fire at Shorrocks Hill Country Club in Lifeboat Road, Formby, was discovered at about 05:40 BST.
A joint investigation with Merseyside Fire and Rescue Service is under way into the cause of the blaze, Merseyside Police said.
The dead man is believed to be Andrew Coogan, although formal identification has yet to take place.
Firefighters said he was found with the horses in a stable which destroyed in the blaze.

Now it's been announced that Bryan Cranston is to make his UK stage debut in an adaptation of the 1970s Oscar-winning film Network.
The 60-year-old US actor will play Howard Beale, a TV news anchor who announces he will kill himself on air after he's told he's being sacked for declining ratings.
In a famous scene, Beale implores his viewers during an on-air meltdown to shout out of the window: "I'm mad as hell and I'm not going to take this any more!"
Adapted by Billy Elliot writer Lee Hall, Network will open on the National Theatre's Lyttelton stage in November.
It will be directed by Ivo van Hove, whose Hedda Gabler at the NT is currently a sell-out hit.
Announcing its new season on Friday, National Theatre boss Rufus Norris described Network as "one of the greatest media satires of all time".
"It's incredibly prescient in terms of the world today," he said. "I think it will stand up in our digital world."
The 1976 film, directed by Sidney Lumet, won four of its 10 Oscar nominations.
Peter Finch, Faye Dunaway and Beatrice Straight cleaned up in three of the four acting categories while writer Paddy Chayefsky won for original screenplay.
Norris said van Hove had been talking about the idea with Cranston for "a couple of years".
"He's got a fantastic pedigree as a stage actor," he said. "It's a part that requires something compelling and special."
Norris pointed out that Beale's "mad as hell" line was still being quoted at demonstrations - and had appeared on a placard held by singer Charlotte Church at a rally in 2015.
Cranston won a Tony award in 2014 for his Broadway debut in Robert Schenkkan's play All the Way. He was Oscar nominated last year for Trumbo.
Other announcements made by the National Theatre on Friday included:
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Members of Unite employed by The OCS Group have rejected three separate offers during a long-running dispute.
The union has 200 members with the company and said the majority are paid just Â£7.65 an hour.
The OCS Group said it was in "active discussion" with the union and hoped for a "swift resolution".
Unite regional officer Jamie Major said: "OCS doesn't seem serious about settling this dispute.
"At the last meeting, management gave four separate options, none of which represented an improved offer...
"OCS was simply manipulating figures to rob better paid staff to fund workers on poverty pay."
In a statement, the company said: "OCS is sorry that we have ended up in dispute... We hope for a swift resolution and we will be working towards that goal in the coming days.
"OCS has made a serious offer to our staff and we remain in constant contact with them and the union.
"We have responded to an invitation from Unite today to further talks and hope to arrange to meet in the coming week for further discussions."
The ballot opens on Thursday and closes on 9 March. Unite warned of "significant strike action" if there is a yes vote.
A man's body has been found by firefighters tackling a blaze that killed a number of horses.
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He's best known for his role as criminal mastermind Walter White in Breaking Bad.
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Workers employed at Gatwick Airport to help passengers with reduced mobility are to vote on strike action in a row over pay.