If someone, let's say, went to the beach (at night of course) and got sand in his hair and it stayed in his hair, the next morning would it be considered a Hasisa (obstacle) for Tefilin?
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It is a Chatzitzah and must be cleaned. See Shulchan Aruch Horav 27:7 ("וה״ה בתפילין של ראש צריך ליזהר בדבר שלא יהא שום דבר חוצץ בין תפילין לשערו ועפר או כנה מתה נקרא חציצה").