Many/most theatre programs have one or more courses in arts administration (if not in the department, then elsewhere in the school).
A quick glance at Google search results shows that these schools appear to have a minor or something similar in arts administration:
Howard
Western Kentucky
Rider
Skidmore
St. Edwards (Theatre Management Specialization)
Montevallo
TCU
Otterbein
SCAD
Boston U
Indiana
Viterbo
You can find more through Google.
Western Michigan offers a BA in Theatre Arts Management but does not appear to be listed by ArtsAdministration.org.