The country's Supreme Court ruled Thursday the vote will be put off indefinitely, The Daily Telegraph of London reported. The Tourist Employees Association of the Maldives responded Friday by promising a "prolonged strike."
Delaying the election "destroys the principles of democracy we have embraced and voids articles of the constitution," the union said.
The Republic of the Maldives, a chain of low-lying islands in the Indian Ocean with a population of about 330,000, is heavily dependent on tourism.
In the first round, Mohamed Nasheed won 45 percent of the vote, putting him in a runoff with Abdulla Yameen, who won 25 percent. Nasheed, the country's first president to be democratically elected, was ousted last year in what his supporters say was a coup, while Yameen is a member of the Progressive Party of Maldives, founded by Maumoon Gayoom, who ruled the country from 1978 to 2008.
Qasim Ibrahim of the Jumhooree Party, a businessman who owns a number of resorts, came in third. He asked the court to throw out the first-round results on the grounds of voter fraud.
Human rights groups have asked tourists to boycott the Maldives, charging human rights abuses. Nasheed also called for a boycott last year, blaming business leaders from the tourist industry for his ouster.