Answer

No, offering chandan with devotion is not a sin in Jain Dharma. But in Digambar tradition, the method of puja may differ from Shwetambar practice, so it is best to follow the vidhi of that temple and sampraday.

Explanation

In Jainism, the main thing is:

• Bhav: pure intention and devotion
• Samyak darshan: right faith
• Aparigraha: detachment and humility

If someone does chandan puja with respectful भावना, it is not sinful. However, if a Digambar temple or acharya has a specific puja-vidhi, one should not mix practices carelessly or insist on one sect’s method in another sect’s place.

So:

• Devotion is good
• Sectarian respect is important
• Temple discipline should be followed

Spiritual Understanding

Jain Dharma teaches that external ritual is secondary to inner purity. A puja becomes meaningful when it is done with:

• reverence
• humility
• non-attachment
• right understanding

It is not proper to judge another Jain tradition harshly. A sincere offering done respectfully is not a sin; disrespect, ego, or sectarian pride are the real spiritual problems.

Takeaway

Chandan puja itself is not a sin in Digambar Jainism. Just follow the tradition of the temple, keep respect for both sects, and focus on pure bhav.