There are a few different artists named “Sagar Shah” online, and at least one of them sings Gujarati devotional songs that include Jain stavans (hymns), for example on themes like saiyam (restraint) and sadhu–sadhvi life.

However:

• I do not find clear, authoritative Jain biographical information about a specific “Jain singer Sagar Shah” in traditional Jain sources.
• Most available information is from general music platforms (Apple Music, YouTube, etc.), not from standard Jain granths or established Jain reference works.

Because my role is to stay within well‑attested Jain knowledge and avoid guessing, I cannot reliably give you a detailed Jain-background biography of him.

If you are looking for Jain stavans:

• You can safely listen to any singer (including Sagar Shah) as long as the lyrics are in line with Jain principles: devotion to Tirthankars, Arihants, Siddhas, Acharyas, Upadhyays, and Sadhus, and promote ahimsa, satya, and saiyam.
• Many Jain families simply choose singers whose pronunciation is clear and whose lyrics match the original Jain stavan texts.

Beyond this, I would have to step outside authentic Jain reference material, so I will stop here.