It is possible one's mind might exist without one's body. One's mind is a different entity from one's body.

Can the mind survive without the brain?

When the brain dies, the mind and consciousness of the being to whom that brain belonged ceases to exist. In other words, without a brain, there can be no consciousness.

What is the relationship between mind and body?

The mind-body connection is the link between a person's thoughts, attitudes, and behaviors and their physical health. While scientists have long understood that our emotions can affect our bodies, we're just now beginning to understand how emotions influence health and longevity.