Use ALTER SCHEMA statement to transfer object from one schema to another:
ALTER SCHEMA new_schema TRANSFER old_schema.table
For example, to construct the query to move all tables from Sales schema to new_schema (AdventureWorks2012), use this:
select 'ALTER SCHEMA new_schema TRANSFER Sales.' + o.name + ';'
from sys.objects o
inner join sys.schemas s on o.schema_id = s.schema_id
where s.name = 'Sales'
and o.type = 'U'