To get names only you can use this query:
SELECT name
FROM sys.parameters
WHERE object_id = OBJECT_ID('YourProcedureName')
To get more detailed info (name, type and length of parameter):
SELECT p.name AS ParameterName, t.name AS ParameterType, p.max_length AS ParameterLength
FROM sys.parameters AS p
JOIN sys.types AS t ON t.user_type_id = p.user_type_id
WHERE object_id = OBJECT_ID('YourProcedureName')
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