Just make another model with all necessery parameters. You want single course and list of courses? Declare appropriate model

public class SingleCourseModel
{
...
public Course CurrentCourse{get;set;}
public IEnumerable<Course> SimilarCourses{get;set;} // or whatever you need
...
}

or

public class SingleCourseModel
{
...
public long CurrentCourseId {get;set;}
public IEnumerable<Course> SimilarCourses{get;set;}
public Course CurrentCourse
{
get
{
return SimilarCourses.FirstOrDefault(c => c.CourseId == CurrentCourseId);
}
}
...
}