Your question is not clear enough to answer correctly.

There are many Jain munis with the name “Sagar” (e.g., Muni Sagar Ji, Acharya Sagar Ji, etc.), from different sanghs and traditions (Digambar / Shwetambar, different gacchas / sampradayas).

To identify the correct sangh, I would need at least one of these:

• Full name (e.g., “Muni 108 Sagarji Maharaj,” “Acharya Sagar Ji” etc.)
• Whether he is Digambar or Shwetambar
• Approximate area (city/state) where you have seen/heard his pravachan
• Any guru’s or sangh’s name associated with him

Without this, anything I say would be guesswork, which is not right for religious matters.