To dream of a boulder represents a major obstacle or problem. A difficult issue or situation that requires all your focus or resources to deal with.
To dream of moving a boulder may reflect your attempts to overcome an enormous challenge or difficulty. Facing a problem that requires all your strength, power, or resources overcome. Feeling that you are stuck with a problem that nobody wants to help you with.
Example: A woman dreamed of having to move a giant blue boulder. In waking life she was close to death and had to plan her own funeral. The boulder reflected how exhausting and emotionally difficult planning her funeral was.