Yes. In Jainism, there is no doctrinal ban on a Terapanthi (or any Jain layperson) marrying someone from another Jain sect. The important point is that both partners strive to live by Jain values—ahimsa, truth, non-possessiveness, and ethical conduct. Differences between Terapanth and other Jain sects are mainly in rituals and governance, not in a prohibition against inter-sect marriage for laypeople. Of course, monastic life (sadhus/sadhvis) is celibate and not involved in marriages.

If the question is about Terapanthi monks or nuns, they do not marry at all; monks and nuns take vows of celibacy.

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Note: This reflects the general Jain perspective on inter-sect and inter-caste marriages for householders; local customs may vary, but they are social practices, not religious prohibitions. You can read more here