The 32-year-old, who skippered the national team during their successful Euro2016 run, feels that his summer move to the Toffees from Swansea City can only help him extend his international playing days.
"I am not retiring. I feel okay, I feel good, I am enjoying it and have no immediate plans for that," said Wiliams ahead of Monday's opening 2018 World Cup qualifier against Moldova.
"I would like to think my move can help me extend my career at the top level.
"I love coming away and playing for Wales. I want to try and keep that going for as long as possible."