Your movie is "Human Cargo," also known as "Escape." It's a 1998
made-for-TV movie starring Treat Williams.
"Treat Williams plays a prefab housing engineer who travels to Saudi
Arabia in the late 70's to cinch a multi-million dollar deal. But when
he arrives he discovers that what he bargained for wasn't actually
much of a bargain. His original deal with the Saudi government
collapses and he is forced to rely on the good graces of his
unreliable but charismatic Arab middle man. As the title implies
things don't get much better and Williams and he must try to escape
before he ends up under a dune in the desert!"
Internet Movie Database: Escape: Human Cargo
"In 1979, John McDonald (nicely played by Treat Williams as less a
blissful optimist than a desperate man concealing his indignation with
a mask of willed hopefulness) goes to Saudi Arabia expecting to
construct prefab homes in collaboration with a wealthy sheik. His
supposed partners, however, are tight-fisted con men, who foist all
expenses on McDonald's shoulders and are perfectly willing to throw
him in jail and confiscate his passport when he balks at paying. The
film is horrified at the plutocratic iniquities of the Saudi legal
system, but it doesn't hesitate to place equal responsibility for the
grotesque mess on its hero, who stubbornly expects everyone to play by
the same rules that work in Texas. Ironically, the film's only
disappointing stretch is the failed suspense of its final act, which
details McDonald's method of escape."
Amazon: Human Cargo VHS
Amazon: Human Cargo DVD
My Google search strategy:
Google Web Search: "treat williams" "human cargo"
I hope this is the correct movie. If it is not, please request
clarification; I'll be glad to offer further assistance before you
rate my answer.