http://www.ind.homeoffice.gov.uk/emp...oringmigrants/
I think his employer needs a sponsor license
employer need to advertise the job in Jobcentre Plus and one more publication. salary must be 22000/a above in order to score enough points.
the next step is for them to get a Certificate of Sponsorship, it is not a paper certificate but a reference number which contains his job title and salary etc. After they got this they will give him the number and he needs to quote it in his application form
i think its possible, depending on how skilled he is maybe tier 1?, if not tier 2 but he needs enough points.
http://www.ukba.homeoffice.gov.uk/em.../tier2skilled/
as long as he currently holds a student visa, i think he can switch into T2 and does not have to go back home country.
but get him to check with UKBA, because you dont mention what he does, how skilled he is, what level is he studying..