The couple are understood to be arranging the private service at the five-star Cromlix House Hotel, close to his home town of Dunblane.
The Wimbledon champion bought the venue, which has its own chapel, for £1.8 million in 2013 and it opened last year following an extensive refurbishment.
The hotel was the venue for his brother Jamie's wedding in 2010.
Murray will marry his girlfriend of almost ten years there on April 11.
Last month, Jamie revealed he had not yet been asked to return the favour by taking on the role at his brother's wedding.
The Victorian mansion features 10 bedrooms and five suites which overlook manicured grounds and tennis courts.
It was named Scottish hotel of the year in 2014 - just weeks after it opened its doors to guests.
Rooms cost up to £595 a night and the property boasts a restaurant overseen by French chef Albert Roux, who personally selected much of the wine list.
The price of some of the wine was criticised last year after it emerged that customers were being charged more than those at the Ritz for certain bottles.
The most expensive was said to be Chateau Lafite Rothschild Pauilliac 2002, at £1,800. A 2001 bottle of the same wine costs £1,230 at the five-star Berkeley Hotel in London.
In the first set of accounts filed for the business, it was valued at £3.44 million.
The abbreviated financial statement, for the period between 5 December 2012 and the end of November 2013, said the valuation was based on the initial purchase price and the subsequent capital spending to improve the property.
The accounts confirmed that Cromlix, near Kinbuck in Perthshire, was wholly owned by the tennis star's 77 Management company.
Murray and Sears got engaged in November after being together for nine years.
The tennis star, who won Wimbledon in 2013, joked during an on-court interview at the recent Australian Open that he might wear a kilt with no underwear at their wedding.
He progressed to the final in Melbourne at the weekend where he was defeated by world number one Novak Djokovic.
Footage earlier emerged of Ms Sears appearing to repeatedly swear in the direction of Murray's semi-final opponent Tomas Berdych.
She then attended Sunday's final wearing a "Parental Advisory: Explicit Content" T-shirt.
When Murray, 27, swept to Wimbledon victory in 2013, bookmaker William Hill offered odds of 8-11 for him to pop the question before the start of last year's tournament.
But the couple's engagement was confirmed in November. Sears, also 27, is a regular presence at Murray's matches and is the daughter of former Lawn Tennis Association head of women's tennis Nigel Sears.
She was once described by future mother-in-law Judy Murray as "the best thing to happen to Andy".