Let your child know you understand - First, you need to communicate that you understand his (or her) struggles in making new friends. Then, give him something tangible, such as a small pebble or key ring he can put in his pocket. Tell him that every time he panics, meeting someone new, to take out the pebble and be reassured that Mom is thinking about him, as well as praying. Let the pebble remind him that he CAN do it.
Meet with your child's teacher - Meet with your child's teacher, sharing your concerns. Then, discuss ways you can work together to help him become more sociable.
Encourage your child to join after school clubs and activities - Wholesome organizations such as Scouting, Little League, and other activities not only help to bring out an introverted kid, but also pick an interest in hobbies that can last for years and even a lifetime.
Invite other children to come over for visits and sleepovers - Continually encourage your child to ask friends to visit. Besides helping him socially, you can also observe what's going on by getting to know his friends.
Host a party - If your child has a birthday coming up, plan a party. On the other hand, you don't have to wait for his birthday. Throw a back-to-school party, harvest festival, etc.
Help your child list questions - Explain to him how he can prepare ahead of time when meeting someone he doesn't know. For example, have him prepare a list of questions to ask such as, "What do you like to do after school? Do you have a favorite TV program?"
Don't lecture - Instead of berating your child for being shy, encourage him. Tell him that he has special gifts and talents and doesn't need to be like everyone else. In other words, don't emphasize his shyness which only makes him more self-conscious. Just point out specifics how he can overcome his fears of meeting new kids
Don't do everything for your child - If the phone rings, encourage your child to answer it. When someone's at the door (and you know it's a safe person), purposely busy yourself, allowing your child to welcome whomever is calling.
Set a good example yourself. In other words, let your child see you go out of your way to be friendly when meeting new people. If he/she sees that it's a pleasurable experience for you, chances are he/she will be more likely to emulate you.