The Mods Revival in Japan solidified in 1981 with a big scooter run and festival called Mods Mayday (taken from the '79 comp). And they've been going strong every year since. A lot of the bands have been quite a mixture of garage punk, indie pop, shibuya kei, ska, along with some more pure Mods groups like The Collectors, The Fave Raves, The Neat Beats, The Shamrock... There's a 25th anniversary comp full of this stuff. There's also regular events connected to these organizers like March of the Mods. This site poorly needs updating, but it's done by the Mods Mayday people:
http://www.thisismodernworld.com/
Some of currently popular Japanese mods bands include:
THE MINNESOTA VOODOO MEN (suits with a garage edge)
THE BAWDIES (Beatles influence, huge right now, will support The Sonics this year)
THE MERCIES (like The Bawdies but all girls and much raunchier!)
THE SHALLOWS (Mods sound with a touch of GS)
THE SCARLETTES (from Osaka, Who covers and such)
And a bunch of girl groups come to mind SHANGHAI BABIES, THAT'S A NO-NO, SIX, THE PHANTASMS...
Some others mentionable are The Playmates, les Cappuccino even Pizzicato Five, known for mixing Mod fashion & sounds with Shibuya Kei electro-pop.
I'm probably missing a bunch but these are the ones that mind at the moment.