Yes. A Khandelwal Vaishya or anyone can become a Jain by adopting Jain principles and vows. Jainism welcomes sincere adoption of the path, regardless of birth or caste.

Simple path for a lay follower (śrāvik/śrāvika):

• Take refuge in the Three Jewels: Namo Arihant, Namo Siddhā, Namo Guru.
• Accept the Five Great Vows (Ahimsa, Satya, Achaurya/Stealing, Brahmacharya, Aparigraha) as your daily guiding vows (these are the core for householders; many followers also practice the additional Anuvratas and Samayik).
• Try to live with non-violence, truthfulness, respect for others’ property, fidelity, and non-attachment in everyday life.
• Engage regularly with a local Jain sangh, temple, or scholar for guidance, prayers, and study.

If you are seriously considering a formal entry as a Jain, you should know:

• There is no single universal conversion rite or certificate for becoming Jain. The path is about faith, practice, and community recognition.
• If you wish to pursue a monastic path, a Diksha (initiation) is involved, and there are differences in how Digambara and Śvetāmbara traditions carry out Diksha and monastic rules. A Jain mendicant or temple authority can explain the specifics for your region.

What to do next:

• Visit or contact your nearest Jain temple or sangh to meet a monk or senior lay teacher.
• Ask about the local practice for a lay entry (refuge in the Three Jewels and taking the Anuvratas) and, if desired, about Diksha options within the tradition you’re drawn to.

You can read more about how a layperson formally aligns with Jainism here