Another Qatari side Police finish third.
Rayyan defeated Police in the title clash
Qatar are in Group C, also comprising Australia, Vietnam and Thailand.
The team, coached by Camilo Soto, will start their AVC Cup campaign with a match against Vietnam on August 8.
It was the sixth title of the season for unstoppable Rayyan.
The reigning champions will take on Al Ahli in the final on May 12.
Al Rayyan lead Al Arabi 1-0 in the other best of three semifinals.
The Lions defeated Police to win their fifth title of the season.
Unbeaten Rayyan have an unassailable 46 points with just two rounds to go
Rayyan lead the table with 41 points while reigning champions Police are on 38
The Qatar League leaders eased past hosts Esperance Sportive de Tunis in the final
Qatar League leaders Rayyan will take on ES Tunis in the final
The Lions lead the table with 26 points from nine games while Police are second
The 42-year old guided Argentina to the Under-23 world title in August
Reigning champions Police defeated Al Khor in Friday's second match