Yes you do need to soak the pea seeds before planting.
Soaking the pea seeds before planting them is a very important step in the planting process of the pea seeds for them to germinate and grow as a healthy plant.
Before planting the pea seeds you need to soak the pea seeds for at least 12 hours before planting them but soaking the pea seeds for 24 hours in water is much better and will help the seeds germinate and grow healthy and properly.
If you do not soak the pea seeds before planting them they may take longer to germinate or might not germinate at all.