Puigdemont had originally been due to meet with Catalan parliament speaker Roger Torrent and four other members of his sacked government at Catalonia's trade mission in Brussels.
But they were forced to move the meeting to another nearby location after Spain's central government ordered Catalonia's representative in Brussels not to allow it to take place at the mission, according to an AFP reporter at the scene.
"The representative of the Catalan government in Brussels has been instructed not to allow this meeting to take place in the building of the Catalan diplomatic mission," the source told AFP just before the meeting was due.
The gathering comes just two days after Torrent - who is also pro-independence - proposed Puigdemont as president of Catalonia following a snap election in December in which separatist parties again won an absolute majority.
More From This Section
But Puigdemont, who faces arrest over his independence push if he returns to Spain, has to figure out how he can be officially voted in at a parliamentary session due by the end of the month.
He has said he could be sworn in from Brussels, a plan Spain's central government opposes. He has also said he would rather return to Spain but the central government vowed to order his arrest.
Charged with rebellion, sedition and misuse of public funds, he has been living in Belgium in self-imposed exile since the end of October.
Catalonia's official representative in Brussels has been under the authority of Madrid since Spain's central government placed the region under its direct control following the independence bid.
"We reserve the right to study the legal implications of this situation", a spokesman for Puigdemont's Together for Catalonia party, Joan Maria Pique, said in Brussels today.