<p>Most universities (at least the ones I know) admit non-degree-seeking or visiting students. The admission procedures vary, as do the academic restrictions that this status carries. A few examples:</p>
<p>[International</a> Guest Student Program | Penn LPS](<a href=“http://www.sas.upenn.edu/lps/international/IGSP]International”>http://www.sas.upenn.edu/lps/international/IGSP)
[Harvard</a> College Admissions § Applying: Visiting Undergraduate Student Program](<a href=“http://www.admissions.college.harvard.edu/apply/vus/index.html]Harvard”>http://www.admissions.college.harvard.edu/apply/vus/index.html)
[Rutgers</a> | Rutgers Admissions](<a href=“http://admissions.rutgers.edu/applynow/moreforparttimeandnondegreeapplicants.aspx#3]Rutgers”>http://admissions.rutgers.edu/applynow/moreforparttimeandnondegreeapplicants.aspx#3)
[Purdue</a> University Calumet | Office of Admissions - Non-Degree Seeking Students](<a href=“http://www.calumet.purdue.edu/admissions/nondegree.html]Purdue”>http://www.calumet.purdue.edu/admissions/nondegree.html)</p>
<p>Visa restrictions might make matters a bit more complicated. A quick Google search revealed that most visiting programs either don’t admit international students at all or require a guarantee that the credits will transfer to the student’s home university.</p>