The Sunda Plate was formerly considered a part of the Eurasian Plate, but the GPS measurements have confirmed its independent movement at 10 mm/yr eastward relative to Eurasia.
https://github.com/davepinch/pinchy.cc/blob/master/content/topics/places/techtonic-plates/sunda-plate/sunda-plate.md
Sunda Plate (Wikipedia) The Sunda Plate is a minor tectonic plate straddling the Equator in the Eastern Hemisphere on which the majority of Southeast Asia is located.