NEW YORK—Bank of America Corp. sold an international credit-card portfolio this year, its third such sale of the year, and said it plans to exit its much larger consumer credit-card operations in the U.K. and Ireland.

The nation's biggest bank by assets said it has reached an agreement to sell its $8.6 billion Canadian card portfolio to Toronto-Dominion Bank for an undisclosed amount. Earlier this year the bank announced deals to sell its Spanish card unit and a small-business card unit in the U.K., and the bank said it now plans to shed other European card units because they aren't core to Chief Executive Brian Moynihan's plans.