The 50-year-old known as 'King Kazu', who netted 12 goals for Japan on the road to France 1998 but has never played at a World Cup, said an expanded tournament would boost the game's popularity in countries where it was a "minor sport".
Asia is expected to get eight or nine places when the World Cup is expanded, compared to 4-1/2 in the current 32-team format.
"The first World Cup I saw only had 16 teams I think," Miura told Reuters in an interview. (The number of teams was increased to 24 in 1982.)
"It was extremely difficult to become a representative of a continent. Even Asia, in my memory, only had two teams until recently (1998). And before that, only one (until 1982).
"And now, it is 4-1/2. I think it is a good change because countries where football is still a minor sport will have their chance too."
Miura, who scored 55 goals in 89 internationals but last played for Japan nearly 17 years ago, said a combination of dreams and hard work were behind his extraordinary longevity.
"My secret? I don't think I have one," he added. "It is important to keep dreaming. So playing at the World Cup is still my dream."
Miura extended his own J League record as the oldest goalscorer in Japanese professional football when he scored the only goal in Yokohama FC's win over Thespa Kusatsu in J-League 2 earlier this month aged 50 years and 14 days.
"Scoring a goal is always a result of regular training -- how well you train, how motivated you are -- that's more important (than my age)," he said.
(Writing by Hardik Vyas/Simon Jennings in Bengaluru; Editing by Ken Ferris)
