Frankly, no rice can mimic the sticky texture of Thai sweet rice.  You can also search for glutinous rice, mochi rice, pearl rice, or waxy rice. If you need a substitute then sushi rice or jasmine rice is okay. The last option is basmati rice. Having said this you will need to monitor the cooking time, addition of water and absorption. Next time I will use short-grain rice and see as both basmati and jasmine are medium-grained rice.