The engineering dept considers international students for its Pratt Scholarship. The Office of Undergraduate Research (https://www.research.undergraduate.vt.edu/) is where most students get started on their research projects once they are already at Tech, I do not believe they offer anything prior to you actually starting classes and they probably fund your research, not your tuition… There are also funded summer opportunities for research, but these programs are also for students once they are already enrolled and the funding does not go to tuition.
@isitan Sponsorship is not a common practice in the US, those ways are really up to you to find out. undercover007 is right, VT (and lots of other US schools) don’t offer much in aid or scholarships for international students. Even the lowest income US students rarely get full grant aid from schools like Tech.