Yes, bodies can still move after death. This movement isn't caused by the person's conscious control, but by the decomposition process. As the body breaks down, muscles and tendons can contract, causing limbs to move and even the entire body to shift position.
Researchers at Australia's first "body farm" observed significant movement in corpses during decomposition, even in advanced stages. This movement can last for over a year after death and has implications for forensic investigations.
For example, a mother may feel her baby moving after a stillbirth. This is usually due to the mother changing position, causing the baby's body to shift within her.
While embalming can help preserve the body and minimize movement, it cannot completely eliminate it.