International postgraduate applicants must typically have an honours degree (at least a 2:2 or equivalent) or an HND with appropriate experience, according to Harper Adams University. Additionally, foreign students must prove their English language skills, usually by taking exams like the PTE or IELTS. A copy of your passport, two academic or professional references, and a personal statement are additional criteria. Most postgraduate courses require an honours degree (2:2 or equivalent) as a prerequisite. 
An HND with relevant experience or an equivalent qualification may be accepted for some courses. 
It's crucial to review the course website because certain courses may have extra requirements.