The Swiss Competition Commission (COMCO) said Swisscom had gained a "dominant position in live broadcasting of games of Swiss football and ice hockey championships as well as of certain foreign football leagues on pay TV."
This was mainly because one of its subsidiaries, Cinetrade, owns exclusive rights regarding the broadcast of sports content on Swiss pay TV, COMCO said.
"Swisscom has abused this dominant position in several respects," it said, pointing out that the company for instance only granted competitors access to a reduced range of sports content.
"With these practices, Swisscom has gained an advantage in the competition between TV platforms in an illicit manner," the competition authority said.
Swisscom and Cinetrade insisted in a statement that they "refute these accusations and consider ... this sanction unfair."
"Swisscom will carefully review the more than 200-page decree that has now been handed down," it said. "Given the very high fine and the decision's fundamental character, an appeal will be lodged with the Federal Administrative Court and, if necessary, the Federal Supreme Court."
Last year the telecomms company was fined 186 million francs for improper pricing of broadband services after as a result of an investigation begun ten years earlier.
The original judgement of 219 million francs was reduced on appeal to the Federal Administrative Court.
Swisscom has since lodged a further appeal to the Federal Supreme Court.